1/2x+2,3/x²-1,x/x²+2x+1通分

问题描述:

1/2x+2,3/x²-1,x/x²+2x+1通分

1/2x+2=(x+1)(x-1)/2(x-1)(x+1)²
3/x²-1=6(x+1)/2(x-1)(x+1)²
x/x²+2x+1=2x(x-1)/2(x-1)(x+1)²