已知x/y=2,求(x²-xy+3y²)/(x²+xy+6y²)的值
1个回答
x/y=2
x=2y
(x²-xy+3y²)/(x²+xy+6y²)
=(4y²-2y²+3y²)/(4t²+2y²+6y²)
=5y²/12y²
=5/12
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