{(x+2y)^2-(x-y)(x+2y)-5y^2}÷(2y),其中x=1,y=3.
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{(x+2y)^2-(x-y)(x+2y)-5y^2}÷(2y),其中x=1,y=3.
{(x+2y)^2-(x-y)(x+2y)-5y^2}÷(2y),其中x=1,y=3.
{(x+2y)^2-(x-y)(x+2y)-5y^2}÷(2y),其中x=1,y=3.
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