For rational numbers $x$ and $y$, if $x
False.
Because, for rational numbers $x$ and $y$, if $x Example, let $x=2$ and $y=3$ Then, $=X-Y$ $=2-3$ $=-1$
Example, let $x=2$ and $y=3$
Then,
$=X-Y$
$=2-3$
$=-1$
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