[tex]7^{18}-7^{17}+7^{16}-7^{15}=7^{15}(7^{3}-7^{2}+7^{1}-7^{0})=7^{15}(343-49+7-1)=7^{15}*300=10 * 30 * 7^{15}=10k, \ gdzie\ k\ to\ liczba\ naturalna\\\\c.n.d[/tex]
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[tex]7^{18}-7^{17}+7^{16}-7^{15}=7^{15}(7^{3}-7^{2}+7^{1}-7^{0})=7^{15}(343-49+7-1)=7^{15}*300=10 * 30 * 7^{15}=10k, \ gdzie\ k\ to\ liczba\ naturalna\\\\c.n.d[/tex]