问题
解答题
先化简,再求值:(x-2)-
|
答案
原式=(x-2)-(
-x x2-4
)4 x+2
=(x-2)-x-4(x-2) x2-4
=(x-2)-
,8-3x x2-4
当x=1时,原式=1-2-
=-1+8-3 1-4
=5 3
.2 3
先化简,再求值:(x-2)-
|
原式=(x-2)-(
-x x2-4
)4 x+2
=(x-2)-x-4(x-2) x2-4
=(x-2)-
,8-3x x2-4
当x=1时,原式=1-2-
=-1+8-3 1-4
=5 3
.2 3