计算,2/x(x+2)+2/(x+2)(x+4)+2/(x+4)(x+6)

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计算,2/x(x+2)+2/(x+2)(x+4)+2/(x+4)(x+6)

计算,2/x(x+2)+2/(x+2)(x+4)+2/(x+4)(x+6)
计算,2/x(x+2)+2/(x+2)(x+4)+2/(x+4)(x+6)

计算,2/x(x+2)+2/(x+2)(x+4)+2/(x+4)(x+6)
原式=1/x -- 1/(x+2) + 1/(x+2) -- 1/(x+4) + 1/(x+4) -- 1/(x+6)
=1/x -- 1/(x+6)
=6/x(x+6)