Question

计算：3a2b-{{2ab2+

2

3

[5a3-

1

2

(-(6a2b+4a3)+6a2b]}

Answer 1

原式=3a²b-{2ab²+

2

3

[5a³-

1

2

（-6a²b+4a³）+6a²b]}
=3a²b-{2ab²+

2

3

[5a³+3a²b-2a³+6a²b]}
=3a²b-2ab²-2a³-6a²b
=-3a²b-2ab²-2a³．