x-1+2-3+4-5+.-99+100=19.94解法
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x-1+2-3+4-5+.-99+100=19.94解法
x-1+2-3+4-5+.-99+100=19.94解法
x-1+2-3+4-5+.-99+100=19.94解法
-1+2-3+4-5+.-99+100每两个分一组
x+(-1+2)+(-3+4)+...+(-99+100)
=x+1+1+...+1
=x+50=19.94
x=-30.06
x+50=19.94
x=-30.06
x+50=19.94 x=--30.06
先不管x,-1+2-3+4-5+......-99+100就是-1+2,-3+4。。。。。。一共五十对,50乘以1等于50所以就是x+50=19.94,所以x=-30.06
左边等于x加50,由了双数和单数相同多,用正的双加负的单等于一,一共有五十个,就得出结果!30.06
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