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Calculeaza a = [tex] \sqrt{114+(2+4+6+...+226)} [/tex]

Răspuns :

salut!
[tex]a= \sqrt{114+2(1+2+3+...+113)}
= \sqrt{144+2 \frac{113*114}{2} } [/tex]
=[tex] \sqrt{114+113*114}= \sqrt{114*114} =114[/tex]
[tex]a = \sqrt{114+(2+4+6+...+226)} \\ \\ a = \sqrt{114+2\cdot(1+2+3+...+113)} \\ \\ a = \sqrt{114+2\cdot \dfrac{113\cdot(113+1)}{2}} \\ \\ a = \sqrt{114+113\cdot (113+1)} \\ \\ a = \sqrt{114+113\cdot 114} \\ \\ a = \sqrt{114\cdot(1+113)}\\ \\ a = \sqrt{114\cdot 114} \\ \\ a = \sqrt{114^2} \\ \\ a= 114[/tex]