(1+2+3+...+9)x+(1+(1-1/2)+(1/2-1/3)+...+(1/7-1/8)+(1/8-1/9))y
=50x+(1+1-1/9)y
=100+270
=370
(x+y)+(2x+1/1*2y)+(3x+1/2*3y)+.+(9x+1/8*9y) x=2 y=90求和
(x+y)+(2x+1/1*2y)+(3x+1/2*3y)+.+(9x+1/8*9y) x=2 y=90求和
数学人气:404 ℃时间:2019-11-02 05:01:31
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