计算：（1）（-3a3）2-a3+（-4a）2-a7+（-5a3）3；（2）30-23+（-3）2-（12）-1；（3）5x（x2+2x+1）-（2x+3）（x-5）；（4）（2x-3y）（-2x-3

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