问题
解答题
先化简,再求值:(x-2-
|
答案
(x-2-
)÷5 x+2 x-3 2x+4
=(
-x2-4 x+2
)•5 x+2 2(x+2) x-3
=
•(x+3)(x-3) x+2 2(x+2) x-3
=2(x+3).
当x=
-3时,原式=2(2
-3+3)=22
.2
先化简,再求值:(x-2-
|
(x-2-
)÷5 x+2 x-3 2x+4
=(
-x2-4 x+2
)•5 x+2 2(x+2) x-3
=
•(x+3)(x-3) x+2 2(x+2) x-3
=2(x+3).
当x=
-3时,原式=2(2
-3+3)=22
.2