1/(x+1)(x+2)+1/(x+2)(x+3)+…+1/(x+99)(x+100)
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1/(x+1)(x+2)+1/(x+2)(x+3)+…+1/(x+99)(x+100)
1/(x+1)(x+2)+1/(x+2)(x+3)+…+1/(x+99)(x+100)
1/(x+1)(x+2)+1/(x+2)(x+3)+…+1/(x+99)(x+100)
1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+99)(x+100)
=1/x-1/(x+1)+1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+.+1/(x+99)-1/(x+100)
=1/x-1/(x+100)
=100/[x(x+100)]
解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1
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