问题
解答题
先化简,再求值:(
|
答案
原式=[
+(x-1)2 (x+1)(x-1)
]÷1 x 1 x+1
=(
+x-1 x+1
)•(x+1)1 x
=
•(x+1)x2+1 x(x+1)
=
,x2+1 x
当x=-2时,原式=
=-(-2)2+1 -2
.5 2
先化简,再求值:(
|
原式=[
+(x-1)2 (x+1)(x-1)
]÷1 x 1 x+1
=(
+x-1 x+1
)•(x+1)1 x
=
•(x+1)x2+1 x(x+1)
=
,x2+1 x
当x=-2时,原式=
=-(-2)2+1 -2
.5 2