Question 1207827
<pre>
2 is a rational number, {{{1/2}}} is also a rational number.
But {{{sqrt(2)}}} is irrational.
{{{matrix(2,3,"","","",
2^(1/2),""="",sqrt(2))}}}

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{{{sqrt(2)}}} is an irational number, 2 is a rational number.
But {{{(sqrt(2))^2=2}}} is rational.

Edwin</pre>