问题
解答题
先化简,再求值:(
|
答案
原式=(
÷(a-1)(a-2)-(a+2) (a+2)(a-2) (a-4)2 (a+2)(a-2)
=
•a(a-4) (a+2)(a-2) (a+2)(a-2) (a-4)2
=
,a a-4
当a=-3时,原式=
=-3 -3-4
.3 7
先化简,再求值:(
|
原式=(
÷(a-1)(a-2)-(a+2) (a+2)(a-2) (a-4)2 (a+2)(a-2)
=
•a(a-4) (a+2)(a-2) (a+2)(a-2) (a-4)2
=
,a a-4
当a=-3时,原式=
=-3 -3-4
.3 7