计算下列各题：（1）-1-3-8-1×(-12)-2×70；（2）[（2x+1）（4x+2）-2]÷（-8x）；（3）（3x+1）2-（3x-1）（3x+1）（4）（a-b-c）2（5）已知：x+y=

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