Question

только 3,4 срочно пожалуйста ​

Answer 1

$b + 2 \frac{4}{11} = \frac{2}{3} \\ b + \frac{26}{11} = \frac{2}{3} \\ b = \frac{2}{3} - \frac{26}{11} = \frac{22 - 78}{33} \\ b = - \frac{56}{33} = - 1 \frac{23}{33}$

$1 \frac{4}{15} - x = 2 \frac{5}{8} \\ \frac{19}{15} - x = \frac{21}{8} \\ x = \frac{19}{15} - \frac{21}{8} = \frac{152 - 315}{120} \\ x = - \frac{163}{120} = - 1 \frac{43}{120}$