问题
解答题
先化简(
|
答案
原式=
•x-1+x+1 (x+1)(x-1) (x-1)(x+3) x(x+3)
=
•2x (x+1)(x-1) (x-1)(x+3) x(x+3)
=
,(4分)2 x+1
又∵x+1≠0,x-1≠0,x≠0,x+3≠0,
∴x≠-1,1,0,-3,(5分)
取x=2,原式=
.(7分)2 3
先化简(
|
原式=
•x-1+x+1 (x+1)(x-1) (x-1)(x+3) x(x+3)
=
•2x (x+1)(x-1) (x-1)(x+3) x(x+3)
=
,(4分)2 x+1
又∵x+1≠0,x-1≠0,x≠0,x+3≠0,
∴x≠-1,1,0,-3,(5分)
取x=2,原式=
.(7分)2 3