问题
解答题
先化简再求值:
|
答案
÷x-3 2x-4 x2-9 x-2
=
•x-3 2x-4 x-2 x2-9
•x-3 2(x-2) x-2 (x+3)(x-3)
=
.1 2(x+3)
当x=-5时,原式=
=-1 2(-5+3)
.1 4
先化简再求值:
|
÷x-3 2x-4 x2-9 x-2
=
•x-3 2x-4 x-2 x2-9
•x-3 2(x-2) x-2 (x+3)(x-3)
=
.1 2(x+3)
当x=-5时,原式=
=-1 2(-5+3)
.1 4