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La $a$, $b$, $x$ og $y$ stå for vilkårlige reelle tall.

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Avgjør hvilke av implikasjonene som gjelder

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$x>b-a$
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$y>\\frac{1}{b}(5-ax)$", "$\\frac{1}{x}>\\frac{1}{y}>0$

$y>x$", "$a^2+b^2=0$

$a=0\\ \\ \\mathrm{og}\\ \\ b=0$", "$a^2+b^2=0$

$a=0\\ \\ \\mathrm{eller}\\ \\ b=0$", "$x^2>0$

$x>0$ ", "$x=2$

$x^4=16$ ", "$x^4=16$

$x=2$ eller $x=-2$", "$x^4=16$

$x=2$ og $x=-2$", "$x=-2$ eller $x=2$

$x\\in\\{-2,2\\}$", "$x\\in\\{-2,2\\}$

$x\\in\\{-2,2,3\\}$", "$x=-2$ eller $x=2$

$x=-2$ eller $x=2$ eller $x=3$", "$x^4=16$

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