如题所述
简便计算过程方法如下
解:83×172-81×127
=81×172+2×172-81×127
=81×45+2×172
=3645+344
=3989
解:83×172-81×127
=81×172+2×172-81×127
=81×45+2×172
=3645+344
=3989
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第1个回答 2020-03-10
好吧先乘除后加减。同级运算从左到右。有括号的先算括号里面的
第2个回答 2020-03-10
==82*172+1*172-82*127+1*127
=82*(172-127)+(172-127)
=82*45+45
=45(82+1)
=45*83
=3735
=82*(172-127)+(172-127)
=82*45+45
=45(82+1)
=45*83
=3735
第3个回答 2020-03-10
83×172-81×127
=81×172+2×172-81×127
=81×45+2×172
=3645+344
=3989
=81×172+2×172-81×127
=81×45+2×172
=3645+344
=3989