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tomas

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  1. tomas

    prove that

    [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]
  2. tomas

    without trig

    4 equations 4 unknowns:
  3. tomas

    without trig

    but i cant do that
  4. tomas

    solve

    no these is so defeclt , i thenk it is not school homework
  5. tomas

    solve

    these is from another forum and i dont no how i can solve it thanks
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