计算2(2x-y)-3(2x+y)-8(2x-y)+8(2x+y)
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计算2(2x-y)-3(2x+y)-8(2x-y)+8(2x+y)
计算2(2x-y)-3(2x+y)-8(2x-y)+8(2x+y)
计算2(2x-y)-3(2x+y)-8(2x-y)+8(2x+y)
2(2x-y)-3(2x+y)-8(2x-y)+8(2x+y)
=-6(2x-y)+5(2x+y)
=-12x+6y+10x+5y
=11y-2x
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