问题
解答题
先化简再求值:(
|
答案
,原式=
•3(x+2)+2(x-2) (x-2)(x+2)
=(x+2)(x-2) x(5x+2)
=5x+2 x(5x+2) 1 x
当x=
时,则原式=6 3
=1 6 3
=3 6
.6 2
先化简再求值:(
|
,原式=
•3(x+2)+2(x-2) (x-2)(x+2)
=(x+2)(x-2) x(5x+2)
=5x+2 x(5x+2) 1 x
当x=
时,则原式=6 3
=1 6 3
=3 6
.6 2