① 2（p+q)-3(p-q)
=2p+2q-3p+3q
=-p+5q
② 1-(2a)-3(3a+1)
=1-2a-9a-3
=-11a-2
③ 5a-6(a+3b)
=5a-6a-18b
=-a-18b
④ (a²+2ab+b²）-（a²-2ab+b²）
=a²+2ab+b²-a²+2ab-b²
=4ab
⑤ 2a-3b-[abc-(2a-a)]+abc
=2a-3b-（abc-a）+abc
=2a-3b-abc+a+abc
=3a-3b