Question

( 3 a2 • 1 b )- 1 2 • a • 3 b

6 ab5

=______．

Answer 1

( 3 a2 • 1 b )- 1 2 • a • 3 b

6 ab5

=

(a 2 3 •b-1)- 1 2 •a 1 2 •b 1 3

a 1 6 •b 5 6

=a-

1

3

+

1

2

-

1

6

•b

1

2

+

1

3

-

5

6

=1．
故答案为：1．