问题
解答题
先化简，再求值：
|
答案
÷x x+2
-x2-x x2+4x+4 x x-1
=
•x x+2
-(x+2)2 x(x-1) x x-1
=
-x+2 x-1 x x-1
=
．2 x-1
将x=1+
代入，3
=2 x-1
=2 1+
-13 2 3
．3
搜题请搜索小程序“爱下问搜题”
先化简，再求值：
|
÷x x+2
-x2-x x2+4x+4 x x-1
=
•x x+2
-(x+2)2 x(x-1) x x-1
=
-x+2 x-1 x x-1
=
．2 x-1
将x=1+
代入，3
=2 x-1
=2 1+
-13 2 3
．3
