1.

[tex] \frac{38}{7} \times \frac{18}{7} + \frac{11}{9} \times \frac{18}{7} [/tex]

[tex]38 \times \frac{2}{7} + 11 \times \frac{2}{7} [/tex]

[tex] \frac{76}{7 } + \frac{22}{7} [/tex]

Ответ: 14

2.

[tex] \frac{17}{6} \times \frac{20}{3} + \frac{3}{10} \times \frac{20}{3} - \frac{20}{3} \times \frac{4}{3} [/tex]

[tex] \frac{17}{3} \times \frac{10}{3} + 2 - \frac{80}{9} [/tex]

[tex] \frac{170}{9} + 2 - \frac{80}{9} [/tex]

Ответ:

12

Пошаговое объяснение:

Вынесем общий множитель за скобки:

№1

2. 4/7 * (4. 2/9 + 1. 2/9) = 2. 4/7 * 5. 4/9 = 18/7 * 49/9 = 2/1 * 7/1 = 14/1 = 14

№2

6. 2/3 * (2. 5/6 + 3/10 - 1. 1/3) = 6. 2/3 * (2. 25/30 + 9/30 - 1. 10/30) = 6. 2/3 * (2. 34/30 - 1. 10/30) = 6. 2/3 * 1. 24/30 = 20/3 * 54/30 = 2/1 * 18/3 = 36/3 = 12