Swaggggask
a fost răspuns

Aratati ca   C=(2^{40} + 2^{39} + 2^{38}):7  este patrat perfect

Răspuns :

[tex]\dfrac{2^{40}+2^{39}+2^{38}}{7}=\dfrac{2^{38}(2^2+2+1)}{7}=2^{38}=(2^{19})^2[/tex]
Tstefanask
[tex] (2^{40} + 2^{39} + 2^{38}):7=2^{38}*(2^{2}+2^{1}+2^{0}):7=[/tex]

[tex]=2^{38}(4+2+1):7=2^{38}*7:7=2^{38}= 2^{19*2}= (2^{19})^{2} cctd[/tex]


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