[(x+y)的2次方-(x+y)(x+3y)-4y的2次方]除以2y其中x=-2,y=1/2
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[(x+y)的2次方-(x+y)(x+3y)-4y的2次方]除以2y其中x=-2,y=1/2
[(x+y)的2次方-(x+y)(x+3y)-4y的2次方]除以2y其中x=-2,y=1/2
[(x+y)的2次方-(x+y)(x+3y)-4y的2次方]除以2y其中x=-2,y=1/2
[(x+y)²-(x+y)(x+3y)-4y²]÷2y
=[(x²+2xy+y²)-(x²+4xy+3y²)-4y²]÷2y
=(x²+2xy+y²-x²-4xy-3y²-4y²)÷2y
=(-2xy-6y²)÷2y
=[2y(-x-3y)]÷2y
=-x-3y
=-(-2)-1/2
=3/2
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