用简便方法计算:7.8*53.9+5.39*22
1个回答
7.8*53.9+5.39*22
=7.8*53.9+53.9*2.2
=53.9*(7.8+2.2)
=53.9*10
=539
相关问题
用简便方法计算下面各题 ①7.32-7/12+2.68-1/4 ②11/9-5/7+7/9-2/7 ③5/8+﹙22/2
简便计算:5.8+2.47+7.53
7.47-5.64+0.53-0.36=要用简便方法计算
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