Question

1)2/5-у=3/7
2)в+2 4/11=2/3
3)а+4 5/12=-3 1/9
4)1 4/15-х=2 5/8

Answer 1

Пошаговое объяснение:

1)

$\frac{2}{5} - y = \frac{3}{7} \\ - y = \frac{3}{7} - \frac{2}{5} \\ - y = \frac{1}{35} \\ y = - \frac{1}{35}$

2)

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

3)

$a + 4 \frac{5}{12} = - 3 \frac{1}{9} \\ a + \frac{53}{12} = - \frac{28}{9} \\ a = - \frac{28}{9} - \frac{53}{12 } \\ a = - \frac{271}{36} = - 7 \frac{19}{36}$

4)

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