(GV) Sejam X e Y números reais quaisquer. Assinale a afirmação correta:

a) [tex]|X+Y| \leq \frac{|x| + |y| }{2}[/tex]
b) [tex]|X-Y| \leq \frac{1}{2} | |X| - |Y| |[/tex]
c) [tex]|X|+|Y| \ \textgreater \ \sqrt{x^{2} + y^{2} }[/tex]
d) [tex]|XY| \ \textgreater \ |X| . |Y|[/tex]
e) [tex]|X| + |Y| \ \textgreater \ 2 \sqrt[2]{x^{2} + y^{2} }[/tex]
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