m=2,n=1.1/mn+1/(m+1)(n+1)+1/(m+2)(n+2)+.+1/(m+10)(n+10)=?
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m=2,n=1.1/mn+1/(m+1)(n+1)+1/(m+2)(n+2)+.+1/(m+10)(n+10)=?
m=2,n=1.1/mn+1/(m+1)(n+1)+1/(m+2)(n+2)+.+1/(m+10)(n+10)=?
m=2,n=1.1/mn+1/(m+1)(n+1)+1/(m+2)(n+2)+.+1/(m+10)(n+10)=?
1/mn+1/(m+1)(n+1)+1/(m+2)(n+2)+.+1/(m+10)(n+10)
=1/1*2+1/2*3+...+1/11*12
=1-1/2+1/2-1/3+..+1/11-1/12
=1-1/12
=11/12
1/M+1/N=5 (3M+MN+2N) / (M-MN=3N)
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