Question

简便运算34.5x76.5-345x6.42-123x1.45

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Answer 1

原式=34.5x76.5-34.5x64.2-123x1.45
=34.5x(76.5 - 64.2)-123x1.45
=34.5x1.23-123x1.45
=34.5x1.23-1.23x145
=1.23x(34.5-145)
= - 1.23x110.5
= - 135.915

考察提取公因式还有小数点左移右移的技巧吧

追问

不对

追答

哪里有问题呢

追问

1.23x(34.5-145)

追答

算错了
哈哈哈
原式=34.5x76.5-34.5x64.2-123x1.45
=34.5x(76.5 - 64.2)-123x1.45
=34.5x12.3-123x1.45
=34.5x12.3-12.3x14.5
=12.3x(34.5-14.5)
= 12.3x20
= 246

Answer 2

34.5X76.5-345x6.42-123x1.45