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a fost răspuns

arata ca nr 2^31×5^30+1 este nr compus ; 2^30×5^31+1 este nr compus.

Răspuns :

Samsunggenius200
[tex] 2^{31}* 5^{30}+1= 2^{1}* 2^{30}* 5^{30}+1=2*(2*5) ^{30}+1=2*10 ^{30} +1 [/tex] ≈ [tex]2*10 ^{30} [/tex]

[tex]2^{30}* 5^{31}+1= 2^{30}* 5^{30}* 5^{1}+1=(2*5) ^{30}*5+1=10 ^{30}*5 +1 [/tex][tex]=5*10 ^{30}+1[/tex] ≈ [tex]5*10 ^{30} [/tex]

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