计算题（1）（3a2）3-（a4）2-（-a5）2-（a2）2（2）（p-q）6÷[（p-q）2（q-p）3]（3）27×（-3）-2×34-81×（-3）-3×（-3）3（4）（a+3）2（a-3）

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