(2x+1)(2x-1)-(2x-1)2 计算,
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计算 x(x+3)-(x-1)(x-2)
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计算1/X(X+1)+1/(X+1)(X+2)+.+1/(X+99)(X+100)
计算:1/x(x+1) + 1/(x+1)(x+2) + .+1/(x+2010)(x+2011)
计算1/x[x+1]+1/[x+1][x+2]+.+1/[x+2006][x+2007]