Пошаговое объяснение:
1) -7/12 + 2/5 = -35/60 + 24/60 = -11/60
2) -0,76 - 0,24 = -1
3) -11/60 - (-1) = -11/60 + 1 = -11/60 + 60/60 = 49/60
4) 49/60 - 1. 17/15 =
49/60 - 1. 68/60 = -1. 19/60
1) -7/12+2/5=-35/60+24/69=-11/60
2) -0, 76-0, 24=1
3) -11/60+1/1=-11/60-60/60=1 49/60
4) -1 49/60-1 17/15=1 49/60- 2 8/60=-1 41/60
