化解求值1/x(x+2)+1/(x+2)(x+4)+1/(x+4)(x+6)+```+1/(x+20)(x+22)

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化解求值1/x(x+2)+1/(x+2)(x+4)+1/(x+4)(x+6)+```+1/(x+20)(x+22)化解求值1/x(x+2)+1/(x+2)(x+4)+1/(x+4)(x+6)+```+

化解求值1/x(x+2)+1/(x+2)(x+4)+1/(x+4)(x+6)+```+1/(x+20)(x+22)
化解求值1/x(x+2)+1/(x+2)(x+4)+1/(x+4)(x+6)+```+1/(x+20)(x+22)

化解求值1/x(x+2)+1/(x+2)(x+4)+1/(x+4)(x+6)+```+1/(x+20)(x+22)
1/x(x+2)=(1/2)(1/x-1/(x+2))
……
累加
=1/2(1/x-1/(x+22))