计算：（1）（2）x2x4+（﹣x3）2﹣x7÷x（3）（4）5x（2x2﹣3x+4）（5）（3x+5）（3﹣2x）（6）（﹣2a﹣1）2（7）（x+2）（y+3）﹣（x+1）（y﹣2）（8）（﹣2p

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