计算[(x+2y)²-(x+y)(x-y)-5y²]÷(2x)
问题描述:
计算[(x+2y)²-(x+y)(x-y)-5y²]÷(2x)
答
[(x+2y)²-(x+y)(x-y)-5y²]÷(2x)
=(x²+4xy+4y²-x²+y²-5y²)÷(2x)
=4xy÷(2x)
=2y