1)32 * 9:12=24 - трубы
Ответ : 24 трубы
1/2 * 1/7 = 1/14
1/2 * 6/7 = 6/14 : 2 = 3/7
1/10 * 1/11 = 1/110
Решение:
(-4)×6×25 = (-6)•(4•25) = - 6•100 = - 600;
-3/7×(-23)×2 1/3 = (-3/7•2 1/3)•(-23) = (-3/7•7/3) • (-23) = -1•(-23) = 23.
<span>-(a-b)-(b-c)=</span>-a+b-b+c=c-a