若x/y=2,求分式(x²-xy+3y²)/(x²+xy+6y²)的值

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若x/y=2,求分式(x²-xy+3y²)/(x²+xy+6y²)的值若x/y=2,求分式(x²-xy+3y²)/(x²+xy+6

若x/y=2,求分式(x²-xy+3y²)/(x²+xy+6y²)的值
若x/y=2,求分式(x²-xy+3y²)/(x²+xy+6y²)的值

若x/y=2,求分式(x²-xy+3y²)/(x²+xy+6y²)的值
x/y=2
x=2y
所以原式=(4y²-2y²+3y²)/(4y²+2y²+6y²)
=5y²/12y²
=5/12