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简便计算:43*67+33*33-7=?急,
人气:284 ℃ 时间:2019-12-07 01:17:28
解答
43*67+33*33-7
=(33+10)*67+33*33-7
=33*67+10*67+33*33-7
=33*(67+33)+670-7
=33*100+670-7
=3300+663
=3963
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