Răspuns:
[tex]7) \: 2(1 {}^{2005} \times 19 \ - 1 {}^{2004} \times 15) = 2(19 - 15) = 2 \times 4 = 8 \\ 11) \: 3(1 {}^{100} - 1 {}^{99} + 1 {}^{98} = 3(1 - 1 + 1) = 3 \times 1 = 3 \\ 3) \: 2 {}^{200 \times 199 \times 198} [/tex]
