а) 3/4 + 2/3 = (33 + 42)/(4*3) = 9/12 + 8/12 = 17/12
б) 3/10 + 2/15 = (33 + 22)/(10*3) = 9/30 + 4/30 = 13/30
в) 4/9 + 1/6 = (42 + 91)/(9*2) = 8/18 + 9/18 = 17/18
г) 7/15 + 3/40 = (78 + 33)/(15*8) = 56/120 + 9/120 = 65/120
а) 3/4 + 2/3 = (33 + 42)/(4*3) = 9/12 + 8/12 = 17/12
б) 3/10 + 2/15 = (33 + 22)/(10*3) = 9/30 + 4/30 = 13/30
в) 4/9 + 1/6 = (42 + 91)/(9*2) = 8/18 + 9/18 = 17/18
г) 7/15 + 3/40 = (78 + 33)/(15*8) = 56/120 + 9/120 = 65/120