问题
解答题
课堂上，朱老师出了这样一道题：已知x=2009-5
|
答案
÷(1+x2-2x+1 x2-1
)=x-3 x+1
÷（(x-1)2 (x+1)(x-1)
+x+1 x+1
）x-3 x+1
=
÷(x-1)2 (x+1)(x-1) 2(x-1) x+1
=
•(x-1)2 (x+1)(x-1) x+1 2(x-1)
=
．1 2
搜题请搜索小程序“爱下问搜题”
课堂上，朱老师出了这样一道题：已知x=2009-5
|
÷(1+x2-2x+1 x2-1
)=x-3 x+1
÷（(x-1)2 (x+1)(x-1)
+x+1 x+1
）x-3 x+1
=
÷(x-1)2 (x+1)(x-1) 2(x-1) x+1
=
•(x-1)2 (x+1)(x-1) x+1 2(x-1)
=
．1 2