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