а)
1) 6/7+14/21= 18/21+14/21= 32/21 = 1 11/21
2) 14/24-15/40= 70/120 - 45/120 = 25/120= 5/24
б)
1) 97/18+ 7 5/12= 97/18+ 89/12 = 1164/216 - 1068/216 = 96/216 = 4/9
а)
1) 6/7+14/21= 18/21+14/21= 32/21 = 1 11/21
2) 14/24-15/40= 70/120 - 45/120 = 25/120= 5/24
б)
1) 97/18+ 7 5/12= 97/18+ 89/12 = 1164/216 - 1068/216 = 96/216 = 4/9