问题
解答题
先化简，再求值：（
|
答案
（
+x+1 x2-1
）÷x x-1 x+1 x2-2x+1
=（
+1 x-1
）•x x-1 (x-1)2 x+1
=
•x+1 x-1 (x-1)2 x+1
=x-1，
当x=2时，运算=2-1=1．
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先化简，再求值：（
|
（
+x+1 x2-1
）÷x x-1 x+1 x2-2x+1
=（
+1 x-1
）•x x-1 (x-1)2 x+1
=
•x+1 x-1 (x-1)2 x+1
=x-1，
当x=2时，运算=2-1=1．