解答下列各题.(1)化简:( 2x x-3 - x x+3 )÷ x x 2 -9 (2

2024-12-12 12:47:51
推荐回答(1个)
回答1:

(1)原式=
2x(x+3)-x(x-3)
(x+3)(x-3)
×
(x+3)(x-3)
x

=2(x+3)-(x-3)
=2x+6-x+3
=x+9;

(2)方程的两边同乘x(x+3),得
x+3=5x,
解得x=
3
4

检验:把x=
3
4
代入x(x+3)≠0.
∴原方程的解为:x=
3
4


(3)原式=
x(x-2)
x-1
×
x-1
x

=x-2,
∵x≠0,1,
∴取x=2,
∴原式=x-2=2-2=0.