下列各式中，正确的有（）①(3b22a)3=3b62a3；②(2xx+y)2=4x2x2+y2；③-a+b-a-b=a+ba-b；④-x+yx-y=-1；⑤x+yx+y=0；⑥(x-y)-2(x+y)

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