1.(a^2b-ab)-(ab^2+ab)+2(ab^2+ba)
=a^2b-ab-ab^2-ab+2ab^2+2ab
=a^2b+ab^2
2.2(a^2-2ab)-3(-2/3a^2-ab)
=2a^2-4ab+2a^2+3ab
=4a^2+ab