先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2

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先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2
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先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2
先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2

先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2
[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2
=(x²+4xy+4y²-3x²-2xy+y²-5y²)÷2x
=(-2x²+2xy)÷2x
=-x+y
=2+1/2
=2.5