Вычислите: 4-5,9= 2/15-3/10= -1/4+2/5= -3/7-20/21 5/6-3/8= -3 1/12-(-1/6)= -2 3/8-1 7/10= -5 1/4 +1 1/8= 4 3/7-8 9/14= -2 3/4- (-3 2/5)= 3 9/9-1 1/12= 2 5/8-3 5/6= -1 3/4 +2 7/8=

Давайте посчитаем: 1. 4-5,9 = -1,9 2. 2/15 - 3/10 = -1/30 3. -1/4 + 2/5 = 3/20 4. -3/7 - 20/21 = -89/147 5. 5/6 - 3/8 = 17/24 6. -3 1/12 - (-1/6) = -2 1/4 7. -2 3/8 - 1 7/10 = -3 1/5 8. -5 1/4 + 1 1/8 = -6 3/8 9. 4 3/7 - 8 9/14 = -4 6/14 = -4 3/7 10. -2 3/4 - (-3 2/5) = 5/4 11. 3 9/9 - 1 1/12 = 2 1/12 12. 2 5/8 - 3 5/6 = -1 3/4 13. -1 3/4 + 2 7/8 = 1/8