(-12,4+8,9)× 1*3/7 = 
= -1,5
2*3/8-1 6/5:-1*5/8 = 267/100 = 2,67
Пошаговое объяснение:
-12,4+8,9 )× 1*3/7 = = -1,5
-3,5 * 3/7 =>
- 7/2 * 3/7 = -1/2 * 3 = -3/2 = -1.5
2*3/8-1 6/5:-1*5/8 = 2,67
2*3/8-1*6/8 : (-1*5/8) =>
3/4 - 1*6/5 : (-5/8)
3/4 + 1 8 6/5 : 5/8
3/4 + 6/5 * 8/5 = 3/4 + 48/25 = 267/100 = 2,67
