1. a. (24 × 12) + (24 × 8) = 24 × (12 + 8) = 280

b. (30 × (-6)) - (30 × (-16)) = 30 × (-6 - (-16)) = 300

c. 20 × ((-10) - 11) = (20 × (-10)) - (20 × 11) = -420

d. 30 × (22 - (-7)) = (30 × 22) - (30 × (-7)) = 870

e. (25 × 4) - (25 × 8) = 25 × (4 - 8) = -100

2. a. (15 × 32) + (15 × 18) = 15 × (32 + 18)

ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ= 15 × 50 = 750

b. (8 × 41) + (8 × 59) = 8 × (41 + 59)

ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ = 8 × 100 = 800

c. (27 × 112) - (27 × 12) = 27 × (112 - 12)

ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ = 27 × 100 = 2700

d. (150 × 32) - (150 × 12) = 150 × (32 - 12)

ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ = 150 × 20 = 3000

e. 3 × 483 = 3 × (400 + 80 + 3) =

ㅤㅤ(3 × 400) + (3 × 80) + (3 × 3) =

ㅤㅤ1200 + 240 + 9 = 1449

semoga membantu^^