通分:1/x+1 1/x+2x+1 1/x+3x+2通分:1/x+1 1/x+2x+1 1/x+3x+2

问题描述:

通分:1/x+1 1/x+2x+1 1/x+3x+2
通分:1/x+1 1/x+2x+1 1/x+3x+2

(1+x)/x
(1+2*x^2+x)/x
(1+3*x^2+2*x)/x