Question

化简：(

2

3

a4b7-

1

9

a2b6)÷(-

1

3

ab3)2=______．

Answer 1

(

2

3

a4b7-

1

9

a2b6)÷(-

1

3

ab3)2
=

2

3

a⁴b⁷÷

1

9

a²b⁶-

1

9

a²b⁶÷

1

9

a²b⁶，
=6a²b-1．