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modul dun 2-radical 7

Răspuns :

[tex]4<7,\;deci \;\sqrt4<\sqrt7,\;sau\;2<\sqrt7\Rightarrow 2-\sqrt7<0\Rightarrow\\\\\Rightarrow |2-\sqrt7|=-(2-\sqrt7)=\sqrt7-2.[/tex]

Green eyes.