1) 6 4/5 - 2 3/8 = (6 + 4/5) - (2 + 3/8) = 6 + 4/5 - 2 - 3/8 = 6 - 2 + 4/5 - 3/8 = 4 + 4/5 - 3/8 = 4 32/40 - 15/40 = 4 17/40
2) 3 4/5 - 2/3 = (3 + 4/5) - 2/3 = 3 + 4/5 - 2/3 = 3 + 4/5 - 10/15 = 3 + 12/15 - 10/15 = 3 + 2/15 = 3 2/15
3) 8 19/20 - 5 7/10 + 3 9/10 + 1 3/10 = (8 + 19/20) - (5 + 7/10) + 3 + 9/10 + 1 + 3/10 = 8 + 19/20 - 5 - 7/10 + 3 + 9/10 + 1 + 3/10 = 5 39/20 - 5 7/10 + 3 + 3 = 0 19/20 + 3 + 3 = 0 + 19/20 + 6 = 1 19/20 + 6 = 1 39/20 = 1 19/20
Итак, результаты:
1) 4 17/402) 3 2/153) 1 19/20
1) 6 4/5 - 2 3/8 = (6 + 4/5) - (2 + 3/8) = 6 + 4/5 - 2 - 3/8 = 6 - 2 + 4/5 - 3/8 = 4 + 4/5 - 3/8 = 4 32/40 - 15/40 = 4 17/40
2) 3 4/5 - 2/3 = (3 + 4/5) - 2/3 = 3 + 4/5 - 2/3 = 3 + 4/5 - 10/15 = 3 + 12/15 - 10/15 = 3 + 2/15 = 3 2/15
3) 8 19/20 - 5 7/10 + 3 9/10 + 1 3/10 = (8 + 19/20) - (5 + 7/10) + 3 + 9/10 + 1 + 3/10 = 8 + 19/20 - 5 - 7/10 + 3 + 9/10 + 1 + 3/10 = 5 39/20 - 5 7/10 + 3 + 3 = 0 19/20 + 3 + 3 = 0 + 19/20 + 6 = 1 19/20 + 6 = 1 39/20 = 1 19/20
Итак, результаты:
1) 4 17/40
2) 3 2/15
3) 1 19/20