7.8+7.8+2.2+2.2=(7.8+2.2)×2.
正確
正確
分析:7.8+7.8+2.2+2.2,此題相加的四個數(shù)中有2個7.8和2個2.2,可以先算出一個7.8與2.2的和,再求此和的2倍即可.
解答:解:7.8+7.8+2.2+2.2=(7.8+2.2)×2.
故答案為:正確.
點(diǎn)評:此題屬于考查乘法結(jié)合律的運(yùn)用.
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