作业帮先化简,再求值：[(x+2y²)²-(x+y)²(x-y²)-5y四次幂]÷2y,其中x=-2,y=2013
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先化简,再求值：[(x+2y²)²-(x+y)²(x-y²)-5y四次幂]÷2y,其中x=-2,y=2013
先化简,再求值：[(x+2y²)²-(x+y)²(x-y²)-5y四次幂]÷2y,其中x=-2,y=2013
先化简,再求值：[(x+2y²)²-(x+y)²(x-y²)-5y四次幂]÷2y,其中x=-2,y=2013