1+2+3+4+5.131+132+133+134=
人气:473 ℃ 时间:2020-02-03 06:07:01
解答
用高斯定理!
原题=(1+134)+(2+133)+.+(67+68)
=(1+134)乘(134/2)
=135乘67
=9045
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