Доказательство:
[tex]6a(a+1) < (3a+1)(2a+1)+a\\\\6a^2+6a < 6a^2+3a+2a+1+a\\\\6a^2+6a < 6a^2+6a+1\\\\6a^2+6a-6a^2-6a < 1\\\\0 < 1[/tex]
ВЕРНО
Неравенство доказано
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Доказательство:
[tex]6a(a+1) < (3a+1)(2a+1)+a\\\\6a^2+6a < 6a^2+3a+2a+1+a\\\\6a^2+6a < 6a^2+6a+1\\\\6a^2+6a-6a^2-6a < 1\\\\0 < 1[/tex]
ВЕРНО
Неравенство доказано