(2 15/18+1 14/18) *18/5+(2 15/18-1 14/18) * (- 2 16/19)=3 28/18*18/5+1 1/18*(-2 16/19)=82/18*18/5+19/18*(-54/19)=82/5+(-3/1)=82/5-15/5=67/5=13 2/5
5/9 + 1/6 = 10/18 + 3/18 = 13/18
4/7 * 14/15 = (4*2)/(1*15) = 8/15
20/27 : 5/6 = 20/27 * 6/5 = (4*6)/(27*1) = 24/27 = 8/9
подставляем и решаем
-2,5*(-0,2):(-7,6-5)=0,5:(-12,6)=-(5:126)=-5\126
124
* 8
---------
32
+ 16
8
----------
992
24a - 6b + 2c = 24 · 0.2 - 6 · 4.8 + 2 · 6.7 = 4,8 - 28,8 + 13,4 = - 10,6