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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