calculati:
[tex]2 {}^{1} \times 2 {}^{2} \times 2 {}^{3} \times ... \times 2 {}^{10} [/tex]
[tex]2 {}^{10} + 2 {}^{11} + ... + 2 {}^{20} [/tex]
[tex]5 {}^{11} \times 5 {}^{13} \times 5 {}^{15} \times ... \times 5 {}^{51} [/tex]
[tex]9 {}^{20} \times 9 {}^{22} \times 9 {}^{24} \times 9 {}^{100} [/tex]
Mulțumesc anticipat! ​