第1个回答 2021-10-03
7.3×9.9
=7.3×(10-0.1)
=7.3×10-7.3×0.1
=73-0.73
=72.27
应用了乘法分配律,使计算变得简便。
第2个回答 2021-10-02
原式7.3×9.9
=7.3×(10-0.1)
=7.3×10-7.3×0.1
=73-0.73
=72.27
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第3个回答 2021-10-03
观察发现乘法算式中9.9接近整数10,
可以拆解9.9进行简便运算:
7.3*9.9
=7.3*(10-0.1)
=7.3*10-7.3*0.1
=73-0.73
=72.27
第4个回答 2021-10-02
7.3×9.9简便计算如下:
7.3×9.9
=7.3×(10-0.1)
=7.3×10-7.3×0.1
=73-0.73
=72.27