December 2018 2 21 Report
Czy liczba 7^100-7^99-2*7^98 jest podzielna przez 10?
A. Tak
B. Nie
ponieważ
A. 7^100-7^99-2*7^98=7^98(7^2-7^1-2)=7^98*40
B. 7^100-7^99-2*7^98=7^99(7^1-7^0-2)=7^99*5
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