83+82+79+77+85+79(用简便计算)
人气:145 ℃ 时间:2019-09-22 03:51:19
解答
83+82+79+77+85+79
=80+3+80+2+80-1+80-3+80+5+80-1
=80×6+(3+2-1-3+5-1)
=480+5
=485
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