1/3x-[1/2y-3(x-1/2y)]其中x=6 y=-1/2
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1/3x-[1/2y-3(x-1/2y)]其中x=6 y=-1/2
1/3x-[1/2y-3(x-1/2y)]其中x=6 y=-1/2
1/3x-[1/2y-3(x-1/2y)]其中x=6 y=-1/2
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