问题
解答题
先化简再求值:(
|
答案
原式=[
-(x+2)(x-2) x(x-2)2
]•x(x-1) x(x-2)2 x x-4
=
•x2-4-x2+x x(x-2)2 x x-4
=
.1 (x-2)2
当x=1时,原式=
=1 (x-2)2
=1.1 (1-2)2
先化简再求值:(
|
原式=[
-(x+2)(x-2) x(x-2)2
]•x(x-1) x(x-2)2 x x-4
=
•x2-4-x2+x x(x-2)2 x x-4
=
.1 (x-2)2
当x=1时,原式=
=1 (x-2)2
=1.1 (1-2)2