86×8584-84×8586简便计算
RT
要求用地等式,简便计算
人气：357 ℃ 时间：2020-05-13 16:23:39
解答
86*8584-84*8586
=(84+2)*8584-84*(8584+2)
=84*8584+2*8584-84*8584-84*2
=2*(8500+84)-2*84
=2*8500
=17000
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