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小数乘除法专项练习200题(有答案)ok

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小数乘除法专项练习200题(有答案)

(1)12.5×0.4×2.5×8,

(2)16.8×10.1 (3)1.25×3.2×0.25 (4)8.48÷0.8×0.9, (5)1.25×2.4, (6)5.85÷1.8×6, (7)5.4÷[2.5×0.8], (8)0.125×32×2.5, (9)5.4÷2.7×0.8, (10)132×101, (11)6.25÷1.25÷0.8, (12)2.5×16,

(13)1.3×2.5÷0.65,

(14)1.08×0.8÷0.27

(15)102×0.45

(16)22.78÷1.25÷0.8

(17)425÷1.25÷8,

(18)0.75×99,

(19)12.5×3.2,

(20)125×3.2×2.5,

(21)3.6×10.1,

(22)5.6×[0.4÷(0.84÷3.36)]

1

(4)7.8﹣7.8÷(1.3×1.5) (35)0.125×32

(23)98.5÷2.5÷4, (37)46.8÷0.9÷0.4,

(24)4.32÷2.4×1.7, (38)0.4×270×2.5,

(25)0.25×3.2×1.25, (26)9.99×1.01, (27)17.5÷0.8÷12.5, (28)10.1×87, (29)1.25×7.2, (30)3.45×102, (31)0.47×0.5×0.8, (33)4×0.8×12.5×2.5, (34)0.25×13×4

小数乘除法--- 2

39)7.2÷1.25÷8,

40)0.25×368×40,

41)7.5×102,

42)12.5×0.25×320,43)103×2.4,

44)78.6÷12.5÷0.8,45)48×0.25×5,

46)0.125×32×2.5,

47)504÷3.2×2.08,

((((

((

(( ((48)12.5×0.76×0.4×8×2.5 (61)9.6÷(9.6×4)

(49)0.8×69.6×12.5, (62)0.78÷0.25×4

(50)6.48÷3.2÷2.5, (63)2.08×(9.6÷2.4)÷4.8

(51)9.6÷0.4×0.25, (52)29.7÷(5.85÷0.65), (53)7.4×9.9, (55)10÷0.2÷2.5, (56)8.4÷0.21÷0.5, (57)1.25×3.2×0.25, (58)14.5×102, (59)2.8×1.2÷4, (60)45÷72÷1.25,

小数乘除法--- 3

)90÷0.4÷2.5,

65)7.52×10.1,

66)1.25×0.7×0.8,

67)0.034×12.5×0.8,

68)101×0.45,

69)0.25×0.9×4

70)3.2÷3.2×0×7.85

71)12.5×3.4×8,

72)17.5÷12.5×1.4,

(((((((( ((73)2.07×8÷1.2, (85)6.8×0.75÷0.5,

(74)4×88×0.25, (86)0.125×0.25×32,

(75)90÷0.4÷2.5, (87)25×32×1.25,

(76)7.52×10.1, (77)1.25×0.7×0.8, (78)0.25×0.8×0.125×0.4,(79)78÷0.25÷0.4, (80)0.25×13.2×4, (81)0.78÷0.25×4, (82)0.35×1.25×2×0.8, (83)2.4×102, (84)18﹣1.8÷0.125÷0.8,

小数乘除法--- 4

88)6.25÷(0.25×4),)2.8×1.2÷4,

90)45÷72÷1.25,

91)0.125×3.2×2.5

92)44.28÷0.9÷4.1

93)9.9×25,

94)1.25×32×0.25,

95)9.9÷0.125÷8,

96)1.25×0.32×2.5,

( (((((( ((97)1.5×105, (109)0.25×6.82×4,

(98)1.25×0.25×61×16, (110)9.2×1.05÷3.4,

(99)2.5×32×1.25, (111)4×3.09×0.25,

(100)48×10.1, (101)7.8÷0.26÷0.3, (102)10.8÷0.27×4, (103)2.5×8×0.4×0.125, (104)0.65×201, (105)0.25×1.25×3.2, (106)86.2÷12.5÷0.8, (107)125×9.3×0.08, (108)3.74÷0.25÷0.4,

小数乘除法--- 5

112)80×9.47×0.125,113)0.36×1.5×0.4,

114)0.05×3.2×40,

115)0.74×4×0.25×4,116)0.25×4.56×40,

116)0.6÷0.125÷0.8,117)3.9÷(1.3×5),

118)0.36×1.5×0.4,

119)0.05×3.2×40,

(((

((

(( ((120)0.525÷13.125÷4×85.2, (132)102×0.45,

(121)125×9.3×0.08, (133)9.6×0.8×0.54

(122)4×3.09×0.25, (134)0.24÷1.2÷0.05

(123)×2.5×0.125, (124)3.76÷0.4÷2.5, (125)1.25×8.37×0.8 (126)8.7×9.9 (127)8.9×9.9, (128)5.6×0.125, (129)9.8×0.99, (130)1.5×99, (131)0.034×0.5×0.6,

小数乘除法--- 6

135)0.72÷0.9×3.5

136)1.25×24×32,

1137)0.25×1.25×0.8×0.4,138)0.5×4÷0.5×4,

139)2.16÷0.9÷0.3,

140)2.6×(0.175÷0.25),

141)930÷5÷0.6

142)8.88÷3.7×1.25,

143)1.25×8.37×0.8

(((

((((( ((144)0.487×12.5÷48.7, (156)12.5×8.8,

(145)6.3×16.9÷0.9÷0.25, (157)0.×100.1,

(146)1.25×0.32×2.5, (158)0.25×0.8×4×0.125,

(147)50.4÷3.2×2.08, (148)204÷(3.4×0.5), (149)40.2×2.7÷16.2×150, (150)2.5×0.×4, (151)7.6×99, (152)5.6×10.2, (153)2.5×3.2×1.25, (154)9.6÷0.4×0.25, (155)(2.5×1.7)×4,

小数乘除法--- 7

159)12.5×2.5×3.2,

160)0.175÷2.5÷0.4,

161)36.3×4.5+6.37×45,

162)(2.44﹣1.8)÷0.4×20,

163)0.88×4.9+5.1×0.88,

1)5.5×17.3+6.7×5.5

165)7.34×8.42+1.58×7.34,

166)(2.6+3.2÷1.28)÷1.7,

167)6.83×(3.8﹣2.3)+1.5×3.7,(((((((( (

(168)4.5×[7.68÷(8.2﹣1.8)], (180)5.5×17.3+2.7×5.5,

(169)26×15.7+15.7×74, (181)1.25×(6.2﹣5.9)×80,

(170)0.45+0.15×997, (182)4.6×(1﹣0.25)+0.75×5.4,

(171)12×0.25+8.8×2.5, (172)(3﹣1.6)÷2.5×0.1, (173)5.04×3.6+50.4×0., (174)26×15.7+15.7×74, (175)(9.37+9.37+9.37+9.37)×2.5,(176)(27.5×0.75﹣3.405)÷0.8, (177)4.02÷[(1﹣0.4)÷0.1], (178)(50﹣20×0.1)÷0.01, (179)4.66×0.28+4.66×0.82﹣4.66,

小数乘除法--- 8

183)127.86×99+127.86,

184)9.74÷[(5﹣3.2)÷3.6]

185)15.4×1.7+9.3×15.4﹣15.4,

186)3.5×[0.95÷1.9],

187)68×0.11+8.9×6.8,

188)5.5×13.3+6.7×5.5,

1)2.74×4.86+4.86×6.26+4.86,

190)0.08×(12.5+2.5)×0.1,

191)(8.16+2.09)÷[(10.3﹣9.3)÷0.4],(((( ((((

(192)28.67×67+3.2×286.7+573.4×0.05, (198)30.8×0.35+6.5×3.08,

(193)4.83×0.59+0.41×0.59﹣0.324×5.9, (199)0.44×8.3+8.3×0.56,

(194)0.8×6.3﹣0.8×3.8, (200)1.76×6.5﹣1.76×5.5,

(195)25×16.7﹣25×0.7, (196)(12.5+1.25)×8,

(197)2.8×3.6+1.4×2.8,

小数乘除法--- 9

201)4.23×9.9+0.423,

参:

(1)12.5×0.4×2.5×8, =(12.5×8)×(0.4×2.5), =100×1, =100;

(2)16.8×10.1

=16.8×10+16.8×0.1, =168+1.68, =169.68;

(3)1.25×3.2×0.25

=(1.25×0.8)×(4×0.25), =1×1, =1.

(4)8.48÷0.8×0.9, =10.6×0.9, =9.54;

(5)1.25×2.4, =1.25×8×0.3, =10×0.3, =3;

(6)5.85÷1.8×6, =3.25×6, =19.5.

(7)5.4÷[2.5×0.8], =5.4÷2, =2.7;

(8)0.125×32×2.5, =(0.125×8)×(4×2.5), =1×10, =10.

(9)5.4÷2.7×0.8, =2×0.8, =1.6;

(10)132×101, =132×(100+1), =132×100+132, =13332;

(11)6.25÷1.25÷0.8, =6.25÷(1.25×0.8), =6.25÷1, =6.25;

(12)2.5×16, =(2.5×4)×4, =40.

(13)1.3×2.5÷0.65, =3.25÷0.65, =5;

(14)1.08×0.8÷0.27

小数乘除法--- =1.08÷0.27×0.8, =4×0.8, =3.2;

(15)102×0.45 =(100+2)×0.45, =100×0.45+2×0.45, =45+0.9, =45.9;

(16)22.78÷1.25÷0.8 =22.78÷(1.25×0.8), =22.78÷1, =22.78;

(17)425÷1.25÷8, =425÷(1.25×8), =425÷10, =42.5;

(18)0.75×99, =0.75×(100﹣1), =0.75×100﹣0.75, =75﹣0.75, =74.25;

(19)12.5×3.2, =12.5×8×0.4, =100×0.4, =40;

(20)125×3.2×2.5, =125×8×0.4×2.5,

=(125×8)×(0.4×2.5), =1000×1, =1000;

(21)3.6×10.1, =3.6×(10+0.1), =3.6×10+3.6×0.1, =36+0.36, =36.36;

(22)5.6×[0.4÷(0.84÷3.36)] =5.6×[0.4÷0.25], =5.6÷1.6, =3.5;

(4)7.8﹣7.8÷(1.3×1.5) =7.8﹣7.8÷1.95, =7.8﹣4, =3.8.

(23)98.5÷2.5÷4, =98.5÷(2.5×4), =98.5÷10, =9.85;

10

(24)4.32÷2.4×1.7, =1.8×1.7, =3.06;

(25)0.25×3.2×1.25, =0.25×4×0.8×1.25,

=(0.25×4)×(0.8×1.25), =1×1, =1;

(26)9.99×1.01, =(10﹣0.01)×1.01, =10.1﹣0.0101, =10.09;

(27)17.5÷0.8÷12.5, =17.5÷(0.8×12.5), =17.5÷1, =17.5;

(28)10.1×87, =(10+0.1)×87, =87+8.7, =95.7;

(29)1.25×7.2, =1.25×8×0.9, =10×0.9, =9.

(30)3.45×102, =3.45×(100+2), =3.45×100+3.45×2, =345+6.9, =351.9;

(31)0.47×0.5×0.8, =0.47×(0.5×0.8), =0.47×0.4, =0.188;

(33)4×0.8×12.5×2.5, =(4×2.5)×(0.8×12.5), =10×10, =100.

(34)0.25×13×4 =0.25×4×13, =1×13, =13;

(35)0.125×32 =0.125×8×4, =1×4, =4.

(37)46.8÷0.9÷0.4, =46.8÷(0.9×0.4), =46.8÷0.36, =130;

小数乘除法--- (38)0.4×270×2.5, =(0.4×2.5)×270, =270;

(39)7.2÷1.25÷8, =7.2÷8÷1.25, =0.9÷1.25, =0.72.

(40)0.25×368×40, =0.25×368×4×10,

=(0.25×4)×(368×10), =1×3680, =3680;

(41)7.5×102, =7.5×(100+2), =7.5×100+7.5×2, =750+15, =765;

(42)12.5×0.25×320, =(12.5×80)×(0.25×4), =1000×1, =1000;

(43)103×2.4, =(100+3)×2.4, =100×2.4+3×2.4, =240+7.2, =247.2;

(44)78.6÷12.5÷0.8, =78.6÷(12.5×0.8), =78.6÷10, =7.86;

(45)48×0.25×5, =(8×0.25)×(6×5), =2×30, =60;

(46)0.125×32×2.5, =(0.125×8)×(4×2.5), =1×10, 10;

(47)504÷3.2×2.08, =157.5×2.08, =327.6;

(48)12.5×0.76×0.4×8×2.5

=(12.5×8)×(0.4×2.5)×0.76,=100×1×0.76, =76.

(49)0.8×69.6×12.5, =(0.8×12.5)×69.6, =10×69.6, =696;

11

(50)6.48÷3.2÷2.5, =6.48÷(3.2×2.5), =6.48÷8, =0.81;

(51)9.6÷0.4×0.25, =24×0.25, =6;

(52)29.7÷(5.85÷0.65), =29.7÷9, =3.3;

(53)7.4×9.9, =7.4×(10﹣0.1), =7.4×10﹣7.4×0.1, =74﹣0.74, =73.26;

(55)10÷0.2÷2.5, =10÷(0.2×2.5), =10÷0.5, =20;

(56)8.4÷0.21÷0.5, =40÷0.5, =80;

(57)1.25×3.2×0.25, =(1.25×8)×(0.4×0.25), =10×0.1, =1;

(58)14.5×102, =14.5×(100+2), =14.5×100+14.5×2, =1450+29, =1479;

(59)2.8×1.2÷4, =2.8×(1.2÷4), =2.8×0.3, =0.84;

(60)45÷72÷1.25, =45÷(72×1.25), =45÷(8×1.25×9), =45÷(10×9), =45÷90, =0.5;

(61)9.6÷(9.6×4) =9.6÷9.6÷4, =1÷4, =0.25;

(62)0.78÷0.25×4 =3.12×4, =12.48;

(63)2.08×(9.6÷2.4)÷4.8

小数乘除法--- =2.08×4÷4.8, =8.32÷4.8, =

()90÷0.4÷2.5, =90÷(0.4×2.5), =90÷1, =90;

(65)7.52×10.1, =7.52×(10+0.1), =7.52×10+7.52×0.1, =75.2+0.752, =75.952;

(66)1.25×0.7×0.8, =1.25×0.8×0.7, =1×0.7, =0.7.

(67)0.034×12.5×0.8, =0.034×(12.5×0.8), =0.034×10, =0.34;

(68)101×0.45, =(100+1)×0.45, =100×0.45+1×0.45, =45+0.45, =45.45.

(69)0.25×0.9×4=0.9, (70)3.2÷3.2×0×7.85=0.(71)12.5×3.4×8, =12.5×8×3.4, =100×3.4, =340;

(72)17.5÷12.5×1.4, =1.4×1.4, =1.96;

(73)2.07×8÷1.2, =16.56÷1.2, =13.8;

(74)4×88×0.25, =(4×0.25)×88, =1×88, =88;

(75)90÷0.4÷2.5, =90÷(0.4×2.5), =90÷1, =90;

(76)7.52×10.1, =7.52×(10+0.1), =7.52×10+7.52×0.1,

12

=75.2+0.752, =75.952;

(77)1.25×0.7×0.8, =1.25×0.8×0.7, =1×0.7, =0.7.

(78)0.25×0.8×0.125×0.4, =(0.25×0.4)×(0.125×0.8), =0.1×0.1, =0.01;

(79)78÷0.25÷0.4, =78÷(0.25×0.4), =78÷0.1, =780.

(80)0.25×13.2×4, =(0.25×4)×13.2, =1×13.2, =13.2;

(81)0.78÷0.25×4, =3.12×4, =12.48;

(82)0.35×1.25×2×0.8, =(0.35×2)×(1.25×0.8), =0.7×1, =0.7;

(83)2.4×102, =2.4×(100+2), =2.4×100+2.4×2, =240+4.8, =244.8;

(84)18﹣1.8÷0.125÷0.8, =18﹣1.8÷(0.125×0.8), =18﹣1.8÷0.1, =18﹣18, =0.

(85)6.8×0.75÷0.5, =68×(0.75÷0.5), =68×1.5, =102;

(86)0.125×0.25×32, =0.125×0.25×4×8,

=(0.125×8)×(0.25×4), =1×1, =1;

(87)25×32×1.25, =25×4×8×1.25,

=(25×4)×(8×1.25), =100×10, =1000;

小数乘除法--- (88)6.25÷(0.25×4), =6.25÷1, =6.25.

()2.8×1.2÷4, =2.8×(1.2÷4), =2.8×0.3, =0.84;

(90)45÷72÷1.25, =45÷(72×1.25), =45÷(8×1.25×9), =45÷(10×9), =45÷90, =0.5;

(91)0.125×3.2×2.5 =(0.125×8)×(0.4×2.5), =1×1, =1;

(92)44.28÷0.9÷4.1 =49.2÷4.1, =12;

(93)9.9×25, =(10﹣0.1)×25, =250﹣2.5, =247.5;

(94)1.25×32×0.25, =1.25×8×4×0.25,

=(1.25×8)×(4×0.25), =10×1, =10;

(95)9.9÷0.125÷8, =9.9÷(0.125×8), =9.9÷1, =9.9;

(96)1.25×0.32×2.5, =1.25×(0.8×0.4)×2.5, =(1.25×0.8)×(2.5×0.4), =1×1, =1;

(97)1.5×105, =1.5×(100+5), =1.5×100+1.5×5, =150+7.5, =157.5;

(98)1.25×0.25×61×16, =1.25×0.25×61×8×2,

=(1.25×8)×(0.25×2)×61,=10×0.5×61, =5×61, =305.

13

(99)2.5×32×1.25, =2.5×4×8×1.25,

=(2.5×4)×(8×1.25), =10×10, =100;

(100)48×10.1, =48×(10+0.1), =48×10+48×0.1, =480+4.8, =484.8;

(101)7.8÷0.26÷0.3, =7.8÷(0.26×0.3), =7.8÷0.078, =100;

(102)10.8÷0.27×4, =40×4, =160.

(103)2.5×8×0.4×0.125,=2.5×0.4×(8×0.125), =1×1, =1;

(104)0.65×201, =0.65×(200+1), =0.65×200+0.65, =130+0.65, =130.65;

(105)0.25×1.25×3.2, =0.25×4×(1.25×0.8), =1×1, =1;

(106)86.2÷12.5÷0.8, =86.2÷(12.5×0.8), =86.2÷10, =8.62;

(107)125×9.3×0.08, =125×0.08×9.3, =10×9.3, =93;

(108)3.74÷0.25÷0.4, =3.74÷(0.25×0.4), =3.74÷0.1, =37.4.

(109)0.25×6.82×4, =(0.25×4)×6.82, =1×6.82, =6.82;

(110)9.2×1.05÷3.4, =9.66÷3.4,

小数乘除法--- ≈2.84

(111)4×3.09×0.25, =4×0.25×3.09, =1×3.09, =3.09;

(112)80×9.47×0.125, =80×0.125×9.47, =10×9.47, =94.7.

(113)0.36×1.5×0.4, =0.36×(1.5×0.4), =0.36×0.6, =0.216;

(114)0.05×3.2×40, =(0.05×40)×3.2, =2×3.2 =6.4;

(115)0.74×4×0.25×4, =(0.74×4)×(0.25×4), =2.96×1, =2.96.

(116)0.25×4.56×40, =(0.25×40)×4.56, =10×4.56, =45.6;

(116)0.6÷0.125÷0.8, =0.6÷(0.125×0.8), =0.6÷0.1, =6;

(117)3.9÷(1.3×5), =3.9÷6.5, =0.6;

(118)0.36×1.5×0.4, =0.36×(1.5×0.4), =0.36×0.6, =0.216;

(119)0.05×3.2×40, =(0.05×40)×3.2, =2×3.2 =6.4;

(120)0.525÷13.125÷4×85.2,=0.525÷(13.125×4)×85.2, =0.525÷52.5×85.2, =0.01×85.2, =0.852.

(121)125×9.3×0.08, =125×0.08×9.3, =10×9.3, =93;

14

(122)4×3.09×0.25, =4×0.25×3.09, =1×3.09, =3.09;

(123)×2.5×0.125, =(8×8)×2.5×0.125, =(8×2.5)×(8×0.125), =20×1, =20;

(124)3.76÷0.4÷2.5, =3.76÷(0.4×2.5), =3.76÷1, =3.76;

(125)1.25×8.37×0.8 =1.25×0.8×8.37, =1×8.37, =8.37;

(126)8.7×9.9 =8.7×(10﹣0.1), =8.7×10﹣8.7×0.1, =87﹣0.87, =86.13

(127)8.9×9.9, =8.9×(10﹣0.1), =8.9×10﹣8.9×0.1, =﹣0., =88.11;

(128)5.6×0.125, =0.7×8×0.125, =0.7×(8×0.125), =0.7×1, =0.7;

(129)9.8×0.99, =9.8×(1﹣0.01), =9.8﹣0.098, =9.702;

(130)1.5×99, =1.5×(100﹣1), =1.5×100﹣1.5×1, =150﹣1.5, =148.5;

(131)0.034×0.5×0.6, =0.034×(0.5×0.6), =0.034×0.3, =0.0102;

(132)102×0.45, =(100+2)×0.45, =100×0.45+2×0.45, =45+0.9,

小数乘除法--- =45.9.

(133)9.6×0.8×0.54 =7.68×0.54, =4.1472;

(134)0.24÷1.2÷0.05 =0.2÷0.05, =4;

(135)0.72÷0.9×3.5 =0.8×3.5, =2.8;

(136)1.25×24×32, =1.25×8×3×32,

=(1.25×8)×(3×32), =10×96, =960.

(1137)0.25×1.25×0.8×0.4, =(0.25×0.4)×(1.25×0.8), =0.1×1, =0.1;

(138)0.5×4÷0.5×4, =2÷0.5×4, =4×4, =16;

(139)2.16÷0.9÷0.3, =2.4÷0.3, =8;

(140)2.6×(0.175÷0.25), =2.6×0.7 =1.82

(141)930÷5÷0.6 =930÷(5×0.6), =930÷3, =310.

(142)8.88÷3.7×1.25, =8.88×1.25÷3.7,

=(8+0.8+0.08)×1.25÷3.7,

=(8×1.25+0.8×1.25+0.08×1.25)÷3.7,=(10+1+0.1)÷3.7, =11.1÷3.7, =3.

(143)1.25×8.37×0.8 =1.25×0.8×8.37, =1×8.37, =8.37;

(144)0.487×12.5÷48.7, =0.487÷48.7×12.5, =0.01×12.5, =0.125;

(145)6.3×16.9÷0.9÷0.25,

15

=(6.3÷0.9)×(16.9÷0.25), =7×67.6, =473.2;

(146)1.25×0.32×2.5, =1.25×(0.8×0.4)×2.5, =(1.25×0.8)×(0.4×2.5), =1×1, =1;

(147)50.4÷3.2×2.08, =15.75×2.08, =32.76;

(148)204÷(3.4×0.5), =204÷1.7, =120;

(149)40.2×2.7÷16.2×150, =108.54÷16.2×150, =6.7×150, =1005;

(150)2.5×0.×4, =(2.5×4)×0., =10×0., =8.9;

(151)7.6×99, =7.6×(100﹣1), =7.6×100﹣7.6, =760﹣7.6, =752.4;

(152)5.6×10.2, =5.6×(10+0.2), =5.6×10﹣5.6×0.2, =56﹣1.12, =54.88;

(153)2.5×3.2×1.25, =2.5×0.4×8×1.25,

=(2.5×0.4)×(8×1.25), =1×10, =10,

(154)9.6÷0.4×0.25, =24×0.25, =6; (155)(2.5×1.7)×4, =(2.5×4)×1.7, =10×1.7, =17;

(156)12.5×8.8, =12.5×8×1.1, =(12.5×8)×1.1, =100×1.1, =110;

小数乘除法--- (157)0.×100.1, =0.×(100+0.1), =0.×100﹣0.×0.1, =﹣0.0, =88.911;

(158)0.25×0.8×4×0.125, =(0.25×4)×(0.8×0.125), =1×0.1, =0.1;

(159)12.5×2.5×3.2, =(12.5×8)×(2.5×0.4), =100×1, =100,

(160)0.175÷2.5÷0.4, =0.175÷(2.5×0.4), =0.175÷1, =0.175;

(161)36.3×4.5+6.37×45, =36.3×4.5+63.7×4.5, =(36.3+63.7)×4.5, =100×4.5, =450; (162)(2.44﹣1.8)÷0.4×20, =0.÷0.4×20, =1.6×20, =32;

(163)0.88×4.9+5.1×0.88, =(4.9+5.1)×0.88, =10×0.88, =8.8;

(1)5.5×17.3+6.7×5.5 =(17.3+6.7)×5.5, =24×5.5, =132;

(165)7.34×8.42+1.58×7.34, =7.34×(8.42+1.58), =7.34×10, =73.4; (166)(2.6+3.2÷1.28)÷1.7, =(2.6+2.5)÷1.7, =5.1÷1.7, =3.00;

(167)6.83×(3.8﹣2.3)+1.5×3.7,=6.83×1.5+1.5×3.7, =(6.83+3.7)×1.5, =10.53×1.5, =15.795;

(168)4.5×[7.68÷(8.2﹣1.8)], =4.5×[7.68÷6.4],

16

=4.5×1.2, =5.4.

(169)26×15.7+15.7×74, =(26+74)×15.7, =100×15.7, =1570;

(170)0.45+0.15×997, =0.15×3+0.15×997, =0.15×(3+997), =0.15×1000, =150;

(171)12×0.25+8.8×2.5, =1.2×2.5+8.8×2.5, =(1.2+8.8)×2.5, =10×2.5, =25; (172)(3﹣1.6)÷2.5×0.1, =1.4÷2.5×0.1, =0.56×0.1, =0.056.

(173)5.04×3.6+50.4×0., =5.04×3.6+5.04×6.4, =5.04×(3.6+6.4), =5.04×10, =50.4

(174)26×15.7+15.7×74, =(26+74)×15.7, =100×15.7, =1570; (175)(9.37+9.37+9.37+9.37)×2.5,=9.37×4×2.5, =9.37×(4×2.5), =9.37×10, =93.7. (176)(27.5×0.75﹣3.405)÷0.8, =(20.625﹣3.405)÷0.8, =17.22÷0.8, =21.525;

(177)4.02÷[(1﹣0.4)÷0.1], =4.02÷[0.6÷0.1], =4.02÷6, =0.67; (178)(50﹣20×0.1)÷0.01, =(50﹣2)÷0.01, =48÷0.01, =4800;

(179)4.66×0.28+4.66×0.82﹣4.66,=4.66×(0.28+0.82﹣1), =4.66×0.1,

小数乘除法--- =0.466;

(180)5.5×17.3+2.7×5.5, =5.5×(17.3+2.7), =5.5×20, =110;

(181)1.25×(6.2﹣5.9)×80, =1.25×0.3×80, =1.25×80×0.3, =100×0.3, =30;

(182)4.6×(1﹣0.25)+0.75×5.4, =4.6×0.75+0.75×5.4, =(4.6+5.4)×0.75, =10×0.75, =7.5.

(183)127.86×99+127.86, =127.86×(99+1), =127.86×100, =12786;

(184)9.74÷[(5﹣3.2)÷3.6] =9.74÷[1.8÷3.6], =9.74÷0.5, =19.48;

(185)15.4×1.7+9.3×15.4﹣15.4, =15.4×(1.7+9.3﹣1), =15.4×10, =154.

(186)3.5×[0.95÷1.9], =35×0.5, =17.5;

(187)68×0.11+8.9×6.8, =6.8×1.1+8.9×6.8, =6.8×(1.1+8.9), =6.8×10, =68;

(188)5.5×13.3+6.7×5.5, =5.5×(13.3+6.7), =5.5×20, =110;

(1)2.74×4.86+4.86×6.26+4.86, =(2.74+6.26+1)×4.86, =10×4.86, =48.6;

(190)0.08×(12.5+2.5)×0.1, =(0.08×12.5+0.08×2.5)×0.1, =(1+0.2)×0.1, =1.2×0.1, =0.12; (191)(8.16+2.09)÷[(10.3﹣9.3)÷0.4],17

=10.25÷[1÷0.4], =10.25÷2.5, =4.1.

(192)28.67×67+3.2×286.7+573.4×0.05, =286.7×6.7+3.2×286.7+286.7×2×0.05, =286.7×6.7+3.2×286.7+286.7×0.1, =286.7×(6.7+3.2+0.1) =286.7×10, =2867;

(193)4.83×0.59+0.41×0.59﹣0.324×5.9, =4.83×0.59+0.41×0.59﹣3.24×0.59,

=(4.83+0.41﹣3.24)×0.59, =2×0.59, =1.18;

(194)0.8×6.3﹣0.8×3.8, =(6.3﹣3.8)×0.8, =2.5×0.8, =2;

(195)25×16.7﹣25×0.7, =25×(16.7﹣0.7), =25×16, =400; (196)(12.5+1.25)×8, =12.5×8+1.25×8, =100+10, =110;

(197)2.8×3.6+1.4×2.8, =2.8×(3.6+1.4), =2.8×5, =14;

(198)30.8×0.35+6.5×3.08, =3.08×3.5+6.5×3.08, =3.08×(3.5+6.5), =3.08×10 =30.8

(199)0.44×8.3+8.3×0.56, =(0.44+0.56)×8.3, =1×8.3, =8.3;

(200)1.76×6.5﹣1.76×5.5, =1.76×(6.5﹣5.5), =1.76×1, =1.76;

(201)4.23×9.9+0.423, =4.23×9.9+4.23×0.1, =4.23×(9.9+0.1), =4.23×10, =42.3;

小数乘除法--- 18

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