问题
解答题
先化简,再求值:
|
答案
原式=
÷(x-x2+2x 1+x
)2 x+1
=
÷x(x+2) x+1 x2+x-2 x+1
=
×x(x+2) x+1 x+1 (x+2)(x-1)
=x x-1
当x=2时,原式=
=x x-1
=2.2 2-1
先化简,再求值:
|
原式=
÷(x-x2+2x 1+x
)2 x+1
=
÷x(x+2) x+1 x2+x-2 x+1
=
×x(x+2) x+1 x+1 (x+2)(x-1)
=x x-1
当x=2时,原式=
=x x-1
=2.2 2-1