Номер 234

50000 : 100 • 1000 = 500 • 1000 = 500000

678000 : 1000 • 10 = 678 • 10 = 6780

340 • 100 : 1000 = 34000 : 1000 = 34

890 • 10 • 100 = 8900 • 100 = 890000

47 • 9 - 9 = (40 + 7) • 9 - 9 = 40 • 9 + 7 • 9 - 9 = 360 + 63 - 9 = 360 + 54 = 360 + 40 + 14 = 414

47 • (9 - 9) = 47 • 0 = 0