问题
解答题
求代数式的值:
|
答案
÷x2-2x x2-4
+(x+2)2x x+2
=
•x(x-2) (x+2)(x-2)
+x+2x+2 2x
=
+x+21 2
=x+
,5 2
当x=
时,原式=1 2
+1 2
=3.5 2
求代数式的值:
|
÷x2-2x x2-4
+(x+2)2x x+2
=
•x(x-2) (x+2)(x-2)
+x+2x+2 2x
=
+x+21 2
=x+
,5 2
当x=
时,原式=1 2
+1 2
=3.5 2