Вычислить значение выражения

(21/10*3*5/8+2.4)-10

(21/2*3*1/6+2.4)-10

(63/16+12/5)-10

507/80-10

-293/80

34/45

Пошаговое объяснение:

2,1(3) = 2. (13-1)/90 =

2. 12/90 = 2. 2/15

0,4(6) = (46-4)/90 = 42/90 = 7/15

2,(5) = 2. (5-0)/9 = 2. 5/9

1) 2. 2/15 * 5/8 = 32/15 * 5/8 = 4/3 * 1/1 = 4/3 = 1. 1/3

2) 1. 1/3 + 7/15 = 1. 5/15 + 7/15 = 1. 12/15 = 1. 4/5

3) 1. 4/5 - 2. 5/9 =

1. 36/45 - 2. 25/45 =

1. 36/45 - 1. 70/45 = 34/45