Решите примеры пж: 3 -2/5×3 1/3= -3÷5 1/4-2 1/2÷7/8= 7/8×2 2/3+(-5/6)÷2 1/7= 1/5-(1 1/2-1...

Решите задачу:

$= \frac{18-135+80}{90}=- \frac{37}{90}$ $a) 3- \frac{2}{5}* \frac{10}{3} =3- \frac{2*2}{3} =3-1 \frac{1}{3}=1 \frac{2}{3} \\ b)-3: \frac{21}{4}- \frac{5}{2}: \frac{7}{8} =-3* \frac{4}{21} - \frac{5}{2} * \frac{8}{7} =- \frac{4}{7} - \frac{20}{7}= -\frac{24}{7} =-3 \frac{3}{7} \\ c) \frac{7}{8}* \frac{8}{3}- \frac{5}{6} * \frac{7}{15} = \frac{7}{3}- \frac{7}{18}= \frac{7*6-7}{18} = \frac{35}{18} = 1\frac{17}{18} \\ d) \frac{1}{5} - \frac{3}{2}+ \frac{16}{7}* \frac{7}{18}= \frac{1*18}{90} - \frac{3*45}{90} + \frac{8*10}{9*10}= \\$