通分:(1) x 6a b 2 , y 9 a 2 bc (2) 1 x 2 -5x ,

通分:(1) x 6a b 2 , y 9 a 2 bc (2) 1 x 2 -5x , 2 x 2 -25 , 3 x 2 +5x .
2025-05-19 18:07:30
推荐回答(1个)
回答1:

(1)
x
6a b 2
=
3acx
18 a 2 b 2 c

y
9 a 2 bc
=
2by
18 a 2 b 2 c


(2)
1
x 2 -5x
=
x+5
x(x+5)(x-5)

2
x 2 -25
=
2x
x(x+5)(x-5)

3
x 2 +5x
=
3(x-5)
x(x+5)(x-5)