[(x+y)²-y(2x+y)-8x]/2x

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[(x+y)²-y(2x+y)-8x]/2x
[(x+y)²-y(2x+y)-8x]/2x

[(x+y)²-y(2x+y)-8x]/2x
解[(x+y)²-y(2x+y)-8x]/2x
=[x²+2xy+y²-2xy-y²-8x]/2x
=[x²-8x]/2x
=1/2x-4

2分之x-8