问题
解答题
先化简,再求值:(
|
答案
原式=
×3x(x-1)-x(x+1) (x+1)(x-1)
=(x+1)(x-1) x-2
×2x(x-2) (x+1)(x-1)
=2x,(x+1)(x-1) x-2
当x=
时,原式=2×3 2
=3 2
.3
先化简,再求值:(
|
原式=
×3x(x-1)-x(x+1) (x+1)(x-1)
=(x+1)(x-1) x-2
×2x(x-2) (x+1)(x-1)
=2x,(x+1)(x-1) x-2
当x=
时,原式=2×3 2
=3 2
.3