分式的计算：①aa2-b2-1a+b②b2a-b-a2b-a+a+b③a-2b2（a2b-2）-3④3-x2x-4÷(x+2-5x-2)⑤3b-aa2-b2-a+2ba-b⑥(12a)-2b2(2a2

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