131+132+133+134+135+136+137+138的简便算法
人气:128 ℃ 时间:2020-02-03 02:30:14
解答
原式= 130+1 +130+2+130+3+130+4+130+5+130+6+130+7+130+8
= 130*8 +1+2+3+4+5+6+7+8
=1076
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