求简便方法计算12.5×3.2
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发布时间:2023-11-17 08:41
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热心网友
时间:2024-03-17 11:34
12.5×3.2
=25×0.5×0.4×8
=25×8×0.5×0.4
=200×0.2
=40
热心网友
时间:2024-03-17 11:35
1、12.5*3.2
=(12+0.5)*(3+0.2)
=36+1.5+2.4+0.1
=36+4
=40
2、12.5*3.2
=12.5*3+12.5*0.2
=37.5+2.5
=40
3、12.5*3.2
=10*3.2+2*3.2+0.5*3.2
=32+6.4+1.6
=32+8
=40追问谢谢
热心网友
时间:2024-03-17 11:35
12.5×3=37.5
12.5×0.2=2.5
37.5+2.5=40可以么??追问可以。谢谢
热心网友
时间:2024-03-17 11:36
=12.5×(0.8×4)
=12.5×0.8×4
=10×4
=40追问谢谢
热心网友
时间:2024-03-17 11:36
12.5x3.2
=25x0.5x0.4x8
=25x8x0.5x0.4
=200x0.2=40