tomas
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[math]x[/math] , [math]y[/math],[math]z[/math] non negative reals number and [math]x+y+z=1[/math] . prove that [math]0 \le xy+yz+zx-2xyz \le \frac{7}{27}[/math]
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4 equations 4 unknowns:
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but i cant do that
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no these is so defeclt , i thenk it is not school homework
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these is from another forum and i dont no how i can solve it thanks
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