作业帮化简求值：【（x+2y)²-(x+y)(3x-y)-5y²]/2x,其中x=-2,y=1/2过程
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/20 17:20:20
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化简求值：【（x+2y)²-(x+y)(3x-y)-5y²]/2x,其中x=-2,y=1/2过程
化简求值：【（x+2y)²-(x+y)(3x-y)-5y²]/2x,其中x=-2,y=1/2过程
化简求值：【（x+2y)²-(x+y)(3x-y)-5y²]/2x,其中x=-2,y=1/2过程
【（x+2y)²-(x+y)(3x-y)-5y²]/2x
＝（x²+4xy+4y²-3x²-2xy+y²-5y²）/2x
=(-2x²+2xy)/2x
=-x+y
=2+1/2
=2.5