第二题,不咋懂!求高手解决
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(2m-3,2n-1) 与 (-1,3n-2) 关于 y 轴对称 2m-3=-(-1)=1 2m=4 m=2 2n-1=3n-2 n=1 m=n+1 1/mn+1/(m+1)(n+1)+1/(m+2)(n+2)+.........+1/(m+10)(n+10)=1/n(n+1)+1/(n+1)(n+2)+1/(n+2)(n+3)+.....1/(n+10)(n+11)=1/n-1/(n+1)+1/(n+1)-1/(n+2)+........1/(n+10)-1/(n+10)=1/n+[1/(n+1)-1/(n+1)]+.......[1/(n+10)-1/(n+10)]-1/(n+11)=1/n+0+0+...+0-1/(n+11)=1/n-1/(n+11)= 1-1/12=11/12
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