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378+527+73+22简便计算

378+527+73+22简便计算 解:根据结合律的运用, 原式=(378+22)+(527+73) =400+600 =1000

=378+(527+73) =378+600 =978

=378+(527+73) =378+600 =978 请采纳

527一(376一73) =527-376+73 =527+73-376 =600-376 =224

=(527+73)-(129-71) =600-58 =542

=527+73-129+71 =600-129+71 =471+71 =542

376+527+73+167+289+33+58+39+42+61 配对得600+200+100+100+376+289 =1000+665 =1665.

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