Маша 6
ваня 2
игорь 8
Стив 4
вроде тааак
15.1c+0.9(4c-2.8*1.4-2.8*0.2)-20c=15.1c+0.9(4c-3.92-0.56)-20c=12.1c+0.9*4c-0.9*(-4.48)-20c=12.1c+3.6c-20c-4.032=-1.3c-4.032
(4 - 14/33 * 1 1/21) * 5 5/8 = 20
1) 14/33 * 1 1/21 = 14/33 * 22/21 = (2*2)/(3*3) = 4/9
2) 4 - 4/9 = 3 9/9 - 4/9 = 3 5/9
3) 3 5/9 * 5 5/8 = 32/9 * 45/8 = (4*5)/(1*1) = 20/1 = 20