计算[(x+2y)²-(x+y)(x-y)-5y²]÷(2x)
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计算[(x+2y)²-(x+y)(x-y)-5y²]÷(2x)
计算[(x+2y)²-(x+y)(x-y)-5y²]÷(2x)
计算[(x+2y)²-(x+y)(x-y)-5y²]÷(2x)
[(x+2y)²-(x+y)(x-y)-5y²]÷(2x)
=(x²+4xy+4y²-x²+y²-5y²)÷(2x)
=4xy÷(2x)
=2y
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