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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