Tim x,y thoa man:
$a)\overline{xxyy}=\overline{xx}^2+\overline{yy}^2$
$b)\overline{xx}^y=\overline{xyyx}$
$c)49.\overline{xyz}=16\overline{zyx}$
Edited by E. Galois, 25-08-2013 - 17:13.
Tim x,y thoa man:
$a)\overline{xxyy}=\overline{xx}^2+\overline{yy}^2$
$b)\overline{xx}^y=\overline{xyyx}$
$c)49.\overline{xyz}=16\overline{zyx}$
Edited by E. Galois, 25-08-2013 - 17:13.
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