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6 7 8 9 10 1 3 5 7 9 1 2 3 4 5 6 2 3 4 5
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6 7 8 9 10 1 3 5 7 9 1 2 3 4 5 6 2 3 4 5
m=1,n=3 m=1,n=-3 m=-1,n=-3 m=-1,n=3
n+(n+1)+(n+2)+…+(2n-1)=n2 n+(n+1)+(n+2)+…+(2n-1)=(2n-1)2 n+(n+1)+(n+2)+…+(3n-2)=(2n-1)2 n+(n+1)+(n+2)+…+(3n-1)=(2n-1)2
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6 7 8 9 10 1 3 5 7 9 1 2 3 4 5 6 2 3 4 5