问题
解答题
先化简,再求值:(
|
答案
原式=(
-3 x-1
)•x2-1 x-1 x-1 (x-2)2
=-
•(x+2)(x-2) x-1 x-1 (x-2)2
=-
.x+2 x-2
当x=-1时,原式=-
=-1+2 -1-2
.1 3
先化简,再求值:(
|
原式=(
-3 x-1
)•x2-1 x-1 x-1 (x-2)2
=-
•(x+2)(x-2) x-1 x-1 (x-2)2
=-
.x+2 x-2
当x=-1时,原式=-
=-1+2 -1-2
.1 3