x+1- (x^2+2x)/(x+1)=
问题描述:
x+1- (x^2+2x)/(x+1)=
答
x+1- (x^2+2x)/(x+1)=[x²+2x+1-x²-2x)/(x+1)=1/(x+1)
x+1- (x^2+2x)/(x+1)=
x+1- (x^2+2x)/(x+1)=[x²+2x+1-x²-2x)/(x+1)=1/(x+1)