Question

выполните действия. -5-(-2,9);-5/12-(-7/12);3целых1/2-(-1целая3/4);2целых2/3-3целых5/9;-1целая5/8+3/4;2/5-0,7;-8/15-(-0,4);-3,2-2целых1/3;7,8-8целых1/4

Answer 1

- 5 - (-2.9) = - 5 + 2.9 = - 2.1
- 5/12- (-7/12 ) = -5/12 + 7/12 = 2/12
3 1/2 - (-1 3/4) = 3 1/2 +1 3/4 = 3 2/4 + 1 3/4 = 4 5/4 = 5 1/4
2 2/3 - 3 5/9 = 2 6/9 - 2 14/9 = - 7/9
-1 5/8 + 3/4 = -1 5/8 +6/8 = - 13/8 + 6/8 = - 7/8
2/5-0.7 = 4/10 - 7/10 = - 3/10
- 8/15 - (-0.4) = -8/15 + 2/5 = -8/15 + 6/15 = - 2/15
- 3.2 - 2 1/3 = -3 1/5 -2 1/3 = - 3 3/15 - 2 5/15 = -5 8/15
7,8 - 8 1/4 = 7 4/5 - 8 1/4 = 7 16/20 - 8 5/20 = 7 16/20 - 7 25/20 = - 9/20