问题
解答题
化简求值,(
|
答案
当x=2时,
原式=
•3x x-1
-(x+1)(x-1) x
•x x+1
,(x+1)(x-1) x
=3(x+1)-(x-1),
=3x+3-x+1,
=2x+4,
=2×2+4,
=8.
化简求值,(
|
当x=2时,
原式=
•3x x-1
-(x+1)(x-1) x
•x x+1
,(x+1)(x-1) x
=3(x+1)-(x-1),
=3x+3-x+1,
=2x+4,
=2×2+4,
=8.