问题 填空题
化简:
6a2b
8a3
=______;
1
x-1
-
1
x+1
=______.
答案

6a2b
8a3
=
3b
4a

1
x-1
-
1
x+1
=
x+1
x2-1
-
x-1
x2-1
=
2
x2-1

单项选择题
单项选择题