问题
解答题
先化简后求值:
|
答案
÷(x+2-3+x x-2
)5 x-2
=
÷x+3 x-2 x2-4-5 x-2
=
×x+3 x-2 x-2 (x+3)(x-3)
=
.1 x-3
当x=2008时,原式=
=1 2008-3
.1 2005
先化简后求值:
|
÷(x+2-3+x x-2
)5 x-2
=
÷x+3 x-2 x2-4-5 x-2
=
×x+3 x-2 x-2 (x+3)(x-3)
=
.1 x-3
当x=2008时,原式=
=1 2008-3
.1 2005