已知x2-2xy-3y2=0求(2x+3y)/2y

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已知x2-2xy-3y2=0求(2x+3y)/2y已知x2-2xy-3y2=0求(2x+3y)/2y已知x2-2xy-3y2=0求(2x+3y)/2yx2-2xy+y2-4y2=0(x-y)2-4y2

已知x2-2xy-3y2=0求(2x+3y)/2y
已知x2-2xy-3y2=0求(2x+3y)/2y

已知x2-2xy-3y2=0求(2x+3y)/2y
x2-2xy+y2-4y2=0
(x-y)2-4y2=0
x-y=+2y或-2y
当x-y=+2y
x=3y
所以(2x+3y)/2y=(2*3x+3y)/2y=9/2
当x-y=-2y
x=-y
所以(2x+3y)/2y=[2*(-y)+3y]/2y=1/2

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