已知3x-y=0求3x²+y²分之x²-3xy
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已知3x-y=0求3x²+y²分之x²-3xy
已知3x-y=0求3x²+y²分之x²-3xy
已知3x-y=0求3x²+y²分之x²-3xy
y=3x
x²-3xy/3x²+y²
=x^2-3x*3x/3x^2+(3x)^2
=-8x^2/12x^2
=-2/3