问题
解答题
先化简,再求值:(1+
|
答案
原式=(
+x-1 x-1
)•1 x-1 (x+1)(x-1) 2x
=
•x x-1 (x+1)(x-1) 2x
=
,x+1 2
当x=-3时,原式=
=-1.-3+1 2
先化简,再求值:(1+
|
原式=(
+x-1 x-1
)•1 x-1 (x+1)(x-1) 2x
=
•x x-1 (x+1)(x-1) 2x
=
,x+1 2
当x=-3时,原式=
=-1.-3+1 2