问题
解答题
先化简再求值:(
|
答案
原式=
•3x(x-1)-x(x+1) (x+1)(x-1) x-1 x(x-2)
=
•2x(x-2) (x+1)(x-1) x-1 x(x-2)
=
,2 x+1
当x=tan60°=
时,原式=3
=2
+13
-1.3
先化简再求值:(
|
原式=
•3x(x-1)-x(x+1) (x+1)(x-1) x-1 x(x-2)
=
•2x(x-2) (x+1)(x-1) x-1 x(x-2)
=
,2 x+1
当x=tan60°=
时,原式=3
=2
+13
-1.3