计算：（-1）3+20-(12)-1+9-数学

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• 化简：（1）(3-2)0-(-12)-2（2）（m-3n）-2•（2m-2n-3）-2（3）a-2b2•（-2a2b-2）-2÷（a-4b2）（4）（2m2n-3）3（-mn-2）-2．-数学
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