问题
解答题
计算：-22+（
|
答案
原式=-4+1+2•
+1 2
+(x+1)(x-1) (x-1) 2
•x(x-2) x-2 1 x
=-2+
+1x+1 x-1
=
-1x+1 x-1
=
，2 x-1
当x=
时，原式=1 2
=-4．2
-11 2
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计算：-22+（
|
原式=-4+1+2•
+1 2
+(x+1)(x-1) (x-1) 2
•x(x-2) x-2 1 x
=-2+
+1x+1 x-1
=
-1x+1 x-1
=
，2 x-1
当x=
时，原式=1 2
=-4．2
-11 2