问题
解答题
先化简,再求值:(2-
|
答案
(2-
)÷x+6 x+2 x-2 x2-4
=
•2x+4-x-6 x+2 (x+2)(x-2) x-2
=
•x-2 x+2 (x+2)(x-2) x-2
=x-2.
当x=3时,原式=3-2=1.
先化简,再求值:(2-
|
(2-
)÷x+6 x+2 x-2 x2-4
=
•2x+4-x-6 x+2 (x+2)(x-2) x-2
=
•x-2 x+2 (x+2)(x-2) x-2
=x-2.
当x=3时,原式=3-2=1.