计算下列各式，并且把结果化为只含有正整数指数幂的形式．（1）（a2b-3）-2⋅（a-2b3）2（2）（x5y2z-3）-2（3）a-2b2•（-2a2b-2）-2÷（a-4b2）（4）(34c2a-

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