Частина 2. Номер 229

Виконай дії.

87 • 5 = (80 + 7) • 5 = 80 • 5 + 7 • 5 = 400 + 35 = 435;

73 • 6 = (70 + 3) • 6 = 70 • 6 + 3 • 6 = 420 + 18 = 438;

62 • 7 = (60 + 2) • 7 = 60 • 7 + 2 • 7 = 420 + 14 = 434;

54 • 8 = (50 + 4) • 8 = 50 • 8 + 4 • 8 = 400 + 32 = 432;

46 • 9 = (40 + 6) • 9 = 40 • 9 + 6 • 9 = 360 + 54 = 414.