[(x+2y)²-(x-y)(3x-y)-5y²]÷(2x)
=[x²+4xy+4y²-(3x²-xy-3xy+y²)-5y²]÷2x
=[x²+4xy+4y²-3x²+4xy-y²-5y²]÷2x
=(-2x²+8xy-2y²)÷2x
=-(x-y)²/x +2y
[(x+2y)²-(x-y)(3x-y)-5y²]÷(2x)要过程,谢谢
[(x+2y)²-(x-y)(3x-y)-5y²]÷(2x)要过程,谢谢
数学人气:473 ℃时间:2019-08-21 21:45:39
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