85.42*7903.29-286.5*790.329+79032.9*4.323=多少?

问题描述:

85.42*7903.29-286.5*790.329+79032.9*4.323=多少?

小知识:两数相乘,一个因数扩大若干倍,另一个因数缩小若干倍,积不变
85.42*7903.29-286.5*790.329+79032.9*4.323
=854.2*790.329-286.5*790.329+790.329*432.3
=790.329*(854.2-286.5+432.3)
=790.329*1000
=790329
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