计算：（1）20070+2﹣2﹣（）2+2009（2）（3a2b3）·（﹣2ab4）÷（6a2b3）（3）（2x2）3﹣6x3（x3+2x2﹣x）（4）（2a+3b）2﹣（2a﹣b）（2a+b）-七年

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