Ответ: S₅₀=2700.
Объяснение:
[tex]a_n=2n+3\ \ \ \ \ \ \ S_{50}=?\\\\a_1=2*1+3=2+3=5.\\\\a_{50}=2*50+3=100+3=103.\\\\S_{50}=\frac{5+103}{2}*50 =\frac{108}{2}*50=54*50=2700.[/tex]
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Ответ: S₅₀=2700.
Объяснение:
[tex]a_n=2n+3\ \ \ \ \ \ \ S_{50}=?\\\\a_1=2*1+3=2+3=5.\\\\a_{50}=2*50+3=100+3=103.\\\\S_{50}=\frac{5+103}{2}*50 =\frac{108}{2}*50=54*50=2700.[/tex]