3x^2+4xy-4y^2=0
(3x-2y)(x+2y)=0
则3x-2y=0或x+2y=0
则x=2y/3或x=-2y
当x=2y/3时,9x^2-3xy∕18x^2+y^2=4y²-2y²/8y²+y²=2/9
当x=-2y时,9x^2-3xy∕18x^2+y^2=36y²+6y²/72y²+y²=42/73
3x^2+4xy--4y^2=0 (x≠0,y≠0),求9x^2-3xy∕18x^2+y^2的值
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