问题
解答题
先化简再求值
|
答案
原式=
÷(x-3 x-2
-x2-4 x-2
)5 x-2
=
÷x-3 x-2 (x+3)(x-3) x-2
=
×x-3 x-2 x-2 (x+3)(x-3)
=
,1 x+3
当x=
-3时,原式=3
=1
-3+33
=1 3
.3 3
先化简再求值
|
原式=
÷(x-3 x-2
-x2-4 x-2
)5 x-2
=
÷x-3 x-2 (x+3)(x-3) x-2
=
×x-3 x-2 x-2 (x+3)(x-3)
=
,1 x+3
当x=
-3时,原式=3
=1
-3+33
=1 3
.3 3