下面各題,能用簡便方法計算的用簡便方法計算 2 5 12 5 32 6 4 2 5 0 4 5 4 0 36 0 64 5

2021-04-30 04:17:10 字數 3883 閱讀 8469

1樓:退潮

(1)2.5×12.5×32

=(2.5×4)×(12.5×8),

=10×100,

=1000;

(2)6.4÷2.5÷0.4

=6.4÷(2.5×0.4),

=6.4÷1,

=6.4;

(3)5.4×0.36+0.64×5.4

=5.4×(0.36+0.64),

=5.4×1,

=5.4;

(4)9÷0.75+9÷0.25

=12+36,

=48;

(5)17.2-0.71-0.29

=17.2-(0.71+0.29),

=17.2-1,

=16.2;

(6)8.6+1.4÷2.5

=8.6+0.56,

=9.16.

下面各題,能用簡便方法計算的用簡便方法計算:2.5×12.5×32 6.4÷2.5÷0.4 5.4×0.36+0.64×5.4 9

2樓:古玉紅

(1)2.5×12.5×32

=(2.5×4)×(12.5×8),

=10×100,

=1000;

(2)6.4÷2.5÷0.4

=6.4÷(2.5×0.4),

=6.4÷1,

=6.4;

(3)5.4×0.36+0.64×5.4

=5.4×(0.36+0.64),

=5.4×1,

=5.4;

(4)9÷0.75+9÷0.25

=12+36,

=48;

(5)17.2-0.71-0.29

=17.2-(0.71+0.29),

=17.2-1,

=16.2;

(6)8.6+1.4÷2.5

=8.6+0.56,

=9.16.

計算下面各題,能用簡便方法計算的,要用簡便方法計算.2.5×80×12.5×4648÷[35×(35-37)]521÷[(37

3樓:江南

(1)2.5×80×12.5×4

=(2.5×4)×(12.5×80)

=10×1000

=10000;版

(權2)648÷[35×(35-3

7)]=648÷[35×3

5-35×37]

=648÷(21-15)

=648÷6

=108;

(3)5

21÷[(37-1

14)×56]

=521

÷[514×56

]=521÷25

84=45.

能用簡便方法的用簡便方法計算①12.5×32×2.5; &n...

4樓:登哥

①12.5×32×2.5

=(12.5×8)×(4×2.5)

=100×10

=1000;

②6.8×9.9

=6.8×(10-0.1)

=6.8×10-6.8×0.1

=68-0.68

=67.32;

③9.16×2.5-0.5×9.16

=9.16×(2.5-0.5)

=9.16×2

=18.32;

④(1-0.2)÷(1-0.84)

=0.8÷0.16=5.

求詳細解答:計算下面各題,能簡算

5樓:小小生

18.9×9.9

=18.9×(

10-0.1)

=189-1.89

=187.11

12.5×8.94×0.8

=(12.5×0.8)×8.94

=10×8.94

=89.4

7.4×0.5+7.4÷0.5

=7.4×(0.5+2)

=7.4×2.5

=18.5

4.92÷2.4

=2.05

6.8×32+32×3.2

=32×(6.8+3.2)

=320

(8.1-5.6)÷0.8+7.75

=2.5÷0.8+7.75

=10.875

5.92×2.5

=14.8

5.6×(12.5-8.5÷0.85)

=5.6×2.5

=5.6÷0.4

=143.5×[13-(3.12+5.28)]

=3.5×(13-8.4)

=3.5×4.6

=16.1

下面各題,能簡算的要用簡便方法計算. 2.9+6.46+7.1+3.54 2.3÷8÷12.5 0.4×(25+2.5) 4

6樓:孫叔

(1)2.9+6.46+7.1+3.54,=(2.9+7.1)+(6.46+3.54),=10+10,

=20;

(2)2.3÷8÷12.5,

=2.3÷(8×12.5),

=2.3÷100,

=0.023;

(3)0.4×(25+2.5),

=0.4×25+0.4×2.5,

=10+1,

=11;

(4)4.95×[2.46÷(5.58-5.28)],=4.95×[2.46÷0.3],

=4.95×8.2,

=40.59;

(5)9.16-1.25-3.

16-2.75,=9.16-3.

16-1.25-2.75,=(9.

16-3.16)-(1.25+2.

75),=6-4,=2.

計算下面各題,能簡算的用簡便方法計算. 12.5×8.94×0.8 7.4×0.5+7.4÷0.5 6.8×32+32×3

7樓:壞少

(1)12.5×

8.94×0.8

=12.5×0.8×8.94

=10×8.94

=89.4;

(2)7.4×0.5+7.4÷0.5

=3.7+14.8

=18.5;

(3)6.8×32+32×3.2

=(6.8+3.2)×32

=10×32

=320;

(4)(8.1-5.6)÷0.8+7.75=2.5÷0.8+7.75

=3.125+7.75

=10.875;

(5)5.6×(12.5-8.5÷0.85)=5.6×(12.5-10)

=5.6×2.5

=14;

(6)3.5×[13-(3.12+5.28)]=3.5×[13-8.4]

=3.5×4.6

=16.1.

下面各題,能簡算的要用簡便方法計算.2.9+0.46+7.1+0.5430÷2.5+1.6×2.50.4×(

8樓:餅餅

(1)2.9+0.46+7.1+0.54,=(2.9+7.1)+(0.46+0.56),=10+1,

=11;

(2)30÷2.5+1.6×2.5,

=12+4,

=16;

(3)0.4×(25+2.5),

=25×0.4+2.5×0.4,

=10+1,

=11;

(4)4.97×[2.46÷(5.58-5.28)],=4.97×[2.46÷0.3],

=4.97×8.2,

=40.754.

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