x-{y-2x+[3x-2(y+2x)+5y]}其中x=二分之一 y=-1 先化简在解
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x-{y-2x+[3x-2(y+2x)+5y]}其中x=二分之一 y=-1 先化简在解
x-{y-2x+[3x-2(y+2x)+5y]}其中x=二分之一 y=-1 先化简在解
x-{y-2x+[3x-2(y+2x)+5y]}其中x=二分之一 y=-1 先化简在解
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