计算下列各题．（1）（2a-1b2）2•（-a2b3）•（3ab-2）3；（2）(xx-2-xx+2)÷4x2-x；（3）x2-1x2-2x+1+x2-2xx-2÷x；（4）a2+aa-1÷(a-aa

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