2.395 Выполните действия: в) 1210⋅211+231⋅4;

в) $$12 \frac{1}{10} \cdot 2 \frac{4}{11} + 2 \frac{24}{31} \cdot \frac{7}{4} = \frac{121}{10} \cdot \frac{26}{11} + \frac{86}{31} \cdot \frac{7}{4} = \frac{11 \cdot 11}{10} \cdot \frac{2 \cdot 13}{11} + \frac{86}{31} \cdot \frac{7}{4} = \frac{11 \cdot 13}{5} + \frac{43 \cdot 7}{31 \cdot 2} = \frac{143}{5} + \frac{301}{62} = \frac{143 \cdot 62}{5 \cdot 62} + \frac{301 \cdot 5}{62 \cdot 5} = \frac{8866}{310} + \frac{1505}{310} = \frac{8866 + 1505}{310} = \frac{10371}{310} = 33 \frac{141}{310}$$ Ответ: $$33 \frac{141}{310}$$