б)
1) 2 7/15 + 1 7/12 = 2 28/60 + 1 35/60 = 3 63/60 = 4 1/20
2) 4 1/20 * 1 1/9 = 81/20 * 10/9 = 9/2 = 4 1/2
3) 4 1/2 - 1 7/8 = 4 4/8 - 1 7/8 = 2 5/8
ответ: 2 5/8
в)
1) 3 3/5 * 5/12 = 18/5 * 5/12 = 3/2 = 1 1/2
2) 4 3/10 - 1 1/2 = 4 3/10 - 1 5/10 = 2 8/10 = 2 4/5
3) 2 4/5 * 5/6 = 14/5 * 5/6 = 7/3 = 2 1/3
ответ: 2 1/3
д)
1) 5 8/15 - 4 7/10 = 5 16/30 - 4 21/30 = 25/30 = 5/6
2) 5/6 * 2 2/3 = 5/6 * 8/3 = 20/9 = 2 2/9
3) 2 2/9 - 5/9 = 1 6/9 = 1 2/3
ответ: 1 2/3
е)
1) 5/24 + 5/16 = 10/48 + 15/48 = 25/48
2) 1 2/3 - 3/5 = 1 10/15 - 9/15 = 1 1/15 = 16/15
3) 25/48 * 16/15 = 5/9
4) 5/9 * 1 4/5 = 5/9 * 9/5 = 1
ответ: 1