问题标题:
【化简求值-3(2x-y)-{7x-〔6x+2x-(10x-8y)〕-x-2(3x-4y)}追加30分啊】
问题描述:

化简求值-3(2x-y)-{7x-〔6x+2x-(10x-8y)〕-x-2(3x-4y)}

追加30分啊

彭国茂回答:
  -3(2x-y)-{7x-〔6x+2x-(10x-8y)〕-x-2(3x-4y)}   =-6x+3y-{7x-〔8x-10x+8y)〕-x-6x+8y}   =-6x+3y-{7x-〔-2x+8y)〕-7x+8y}   =-6x+3y-{7x+2x-8y-7x+8y}   =-6x+3y-{2x}   =-8x+3y
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