сравните:
a) [tex] \frac{2}{3} [/tex] и 0,66
б) [tex] \frac{5}{6} [/tex] + [tex] \frac{1}{4} [/tex] и 1,1
в) √11 и 3,4
Докажите, что если а> -5, b> -2, то 4а + 9b> -38

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