计算,2/x(x+2)+2/(x+2)(x+4)+2/(x+4)(x+6)

问题描述:

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)