[（x+2y)²-(x+y)(3x-y)-5y²]÷2x
=[x²+4xy+4y²-(3x²-xy+3xy-y²)-5y²]÷2x
=[x²+4xy+4y²-3x²+xy-3xy+y²-5y²]÷2x
=[-2x²+2xy]÷2x
=-x+y
[（x+2y）x²+（x-y）(3x-y)-5y²]÷2x 要详细的化解步骤 谢谢啊 急
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