7.8*9.9+0.78的简便计算该怎么算

2024-12-02 10:54:18
推荐回答(1个)
回答1:

7.8*9.9+0.78
=7.8x9.9+7.8x0.1
=7.8x(9.9+0.1)
=7.8x10
=78
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