先化简,再求值.x+2分之x-x+2分之x平方+2x+1除以x-1分之x平方-1

分类: 作业答案 • 2023-01-06 18:01:47

问题描述：

答

解x/(x+2)-(x²+2x+1)/(x+2)÷(x²-1)/(x-1)=x/(x+2)-(x+1)²/(x+2)÷(x-1)(x+1)/(x-1)=x/(x+2)-(x+1)²/(x+2)÷(x+1)=x/(x+2)-(x+1)/(x+2)=(x-x-1)/(x+2)=-1/(x+2)