Question

58 ПОВТОРЯЕМ 146. Вычислите. a) 2.5+2.15; 3. B) 3 - 4 + 4 - 3; 9 д) 7. (53 + 47); *)6. (3/1 + 2/3);​

Answer 1

                                            Задание No 146:

а) 2 * 5 + 2 * 15 = 10 + 30 = 40.

в)  1/2 * 4/9 + 4/9 * 3/4 = 4/18 + 12/36 = 2/9 + 3/9 = 5/9.

д)  7 * ( 53 + 47 ) = 7 * 100 = 700.

ж)  6 * ( 3 1/6 + 2 1/3 ) = 6 * ( 3 1/6 + 2 2/6 ) = 6/1 * 5 1/2 = 6/1 * 11/2 =

     = 66/2 = 33/1 = 33.

Answer 2

Пошаговое объяснение:

2 * 5 + 2 * 15 = 2 * (5 + 15) = 2 * 20 = 40

1/2 * 4/9 + 4/9 * 3/4 = 4/9 * (1/2 + 3/4) = 4/9 * (2/4 + 3/4) = 4/9 * 5/4 = 5/9

7 * (53 + 47) = 7 * 100 = 700

6 * (3 1/6 + 2 1/3) = 6 * (3 1/6 + 2 2/6) = 6 * 5 3/6 = 6 * 5 1/2 = 6 * 11/2 = 66/2 = 33