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