... b) Lµm trßn sè 1 573 ®Õn hµng tr¨m tËp 73 1 573 ≈ 1600 ?2 a) 79 ,3826 ≈ 79 ,383 b) 79 ,3826 ≈ 79 ,38 c) 79 ,3826 ≈ 79 ,4 Bµi tËp 73 (tr36-SGK) 7, 923 ≈ 7, 92 17, 418 ≈ 17, 42 79 ,1364 ≈ 70 9,14 50,401 ≈ 50,40 ... 5, 173 C¸ch 1: ≈ = 40 C¸ch 2: 7, 56 5, 173 = 39,1 078 8 ≈ 39 c) 73 ,95 : 14,2 C¸ch 1: ≈ 74 : 14 ≈ C¸ch 2: 73 ,95: 14,2 = 5,2 077 ≈ 21 ,73 .0,815 7, 3 22.1 ≈ C¸ch 1: ≈ 21 ,73 .0,815 ≈ 2,42602 ≈ C¸ch 2: 7, 3 ... bµi tËp 74 (tr36-SGK) §iĨm TB c¸c bµi kiĨm tra cđa b¹n Cêng lµ: (7 + + + 10) + (7 + + + 9).2 + 8.3 = 7, 2(6) ≈ 7, 3 15 - Lµm bµi tËp 76 (SGK) 76 324 75 3 ≈ ≈ ≈ ≈ ≈ ≈ 76 324 75 0 (trßn chơc) 76 324...