问题
解答题
通分: (1)
(2)
|
答案
(1)
=1 6ab2
,3ac 18a2b2c
=1 9a2bc
;2b 18a2b2c
(2)
=a-1 a2+2a+1
,(a-1)2 (a+1)2(a-1)
=6 a2-1
.6(a+1) (a+1)2(a-1)
通分: (1)
(2)
|
(1)
=1 6ab2
,3ac 18a2b2c
=1 9a2bc
;2b 18a2b2c
(2)
=a-1 a2+2a+1
,(a-1)2 (a+1)2(a-1)
=6 a2-1
.6(a+1) (a+1)2(a-1)