6
Пошаговое объяснение:
1) 7/20 * 9 = 63/20
2) 7/36 * 12 = 7/3
3) 1 8/15 : 4 = 23/15 * 1/4 = 23/60
4) 3/5 : 4 1/2 = 3/5 * 2/9 = 2/15
5) 63/20 + 23/60 = 189/60 + 23/60= 212/60
6) 7/3 + 2/15 = 35/15 + 2/15 = 37/15
7) 212/60 + 37/15 = 212/60 + 148/60 = 360/60 = 6
6
Пошаговое объяснение:
1) 7/20 * 9 = 63/20
2) 7/36 * 12 = 7/3
3) 1 8/15 : 4 = 23/15 * 1/4 = 23/60
4) 3/5 : 4 1/2 = 3/5 * 2/9 = 2/15
5) 63/20 + 23/60 = 189/60 + 23/60= 212/60
6) 7/3 + 2/15 = 35/15 + 2/15 = 37/15
7) 212/60 + 37/15 = 212/60 + 148/60 = 360/60 = 6