原式等于(x²-1/x+1)+1={(x+1)(x-1)/x-1}+1=x-1+1=x 原式等于x,求采纳
答案x平方减1
等于X
x²/(x+1)-1/(x+1)+1=(x²-1)/(x+1)+1=(x+1)(x-1)/(x+1)+1=x-1+1=x