3. Cálculo mental2

(125 ÷ 5) + (48 - 24)

(84 + 17) - (45 - 12)

(68 - 29) ÷ 3 + 7

(6 × 9) + (24 ÷ 3)

(52 + 17) × 3 - 25

42

145

56

19

60