计算:4x+2y-5x-y
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计算:4x+2y-5x-y计算:4x+2y-5x-y计算:4x+2y-5x-y4x+2y-5x-y=-x+yy-x-x+y
计算:4x+2y-5x-y
计算:4x+2y-5x-y
计算:4x+2y-5x-y
4x+2y-5x-y
=-x+y
y-x
-x+y
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计算:4x+2y-5x-y
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