如题所述
12.5×3.2
=25×0.5×0.4×8
=25×8×0.5×0.4
=200×0.2
=40追答
=25×0.5×0.4×8
=25×8×0.5×0.4
=200×0.2
=40追答
简便算法好多
一个第二部是为了让你明白
第一部可以省略的
12.5×3.2
=12.5×(3+0.2)
=12.5×3+12.5×0.2
=37.5+2.5
=40
12.5×3.2
=(12+0.5)×(3+0.2)
=12×3+12×0.2+0.5×3+0.5×0.2
=32+2.4+1.5+0.1
=40
三种你可以看看那个更适合你,我建议第一种和最后一种
追问第一种比较容易理解
追答对啊!①③都行
追问谢谢
追答客气,满意的话就采纳下吧
追问嗯
追答奖励都没有真不敞亮
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追答就是积分,额外的积分奖励😁
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追答开个玩笑,别认真
追问好的
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第1个回答 2016-08-25
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
=(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
本回答被网友采纳第2个回答 2016-08-25
12.5×3=37.5
12.5×0.2=2.5
37.5+2.5=40可以么??追问
12.5×0.2=2.5
37.5+2.5=40可以么??追问
可以。谢谢
第3个回答 2016-08-25
=12.5×(0.8×4)
=12.5×0.8×4
=10×4
=40追问
=12.5×0.8×4
=10×4
=40追问
谢谢
第4个回答 2020-09-15
12.5x3.2
=25x0.5x0.4x8
=25x8x0.5x0.4
=200x0.2=40
=25x0.5x0.4x8
=25x8x0.5x0.4
=200x0.2=40