a) 4 7/10 + 1 8/15 = 4 + 1 + 7/10 + 8/15 = 5 + 0.7 + 0.5333 ≈ 5 + 0.7 + 0.53 = 5 + 1.23 = 6.23
б) 3 3/14 + 1 4/63 = 3 + 1 + 3/14 + 4/63 = 4 + 3/14 + 4/63 = 4 + 0.2143 + 0.0635 ≈ 4 + 0.21 + 0.06 = 4 + 0.27 = 4.27
в) 4 4/15 - 2 9/40 = 4 - 2 + 4/15 - 9/40 = 2 + 4/15 - 9/40 = 2 + 0.2667 - 0.225 ≈ 2 + 0.27 - 0.23 = 2 + 0.04 = 2.04
г) 5 1/20 - 2 1/12 = 5 - 2 + 1/20 - 1/12 = 3 + 0.05 - 0.0833 ≈ 3 + 0.05 - 0.08 = 3 - 0.03 = 2.97
a) 4 7/10 + 1 8/15 = 4 + 1 + 7/10 + 8/15 = 5 + 0.7 + 0.5333 ≈ 5 + 0.7 + 0.53 = 5 + 1.23 = 6.23
б) 3 3/14 + 1 4/63 = 3 + 1 + 3/14 + 4/63 = 4 + 3/14 + 4/63 = 4 + 0.2143 + 0.0635 ≈ 4 + 0.21 + 0.06 = 4 + 0.27 = 4.27
в) 4 4/15 - 2 9/40 = 4 - 2 + 4/15 - 9/40 = 2 + 4/15 - 9/40 = 2 + 0.2667 - 0.225 ≈ 2 + 0.27 - 0.23 = 2 + 0.04 = 2.04
г) 5 1/20 - 2 1/12 = 5 - 2 + 1/20 - 1/12 = 3 + 0.05 - 0.0833 ≈ 3 + 0.05 - 0.08 = 3 - 0.03 = 2.97