Вправи 301 - 400 » 362

47 • 2 = 40 • 2 + 7 • 2 = 80 + 14 = 94 41 • 2 = 40 • 2 + 1 • 2 = 80 + 2 = 82 27 • 3 + 457 = 20 • 3 + 7 • 3 + 457 = 60 + 27 + 457 = 81 + 457 = 50 + 450 + 31 + 7 = 500 + 38 = 538 933 – 33 • 3 = 933 – (30 • 3 + 3 • 3) = 933 – (90 + 9) = = 933 – 99 = 834 _9(*)3(*)3 99 834 49 • 2 + 23 • 4 = 40 • 2 + 9 • 2 + 20 • 4 + 3 • 4 = 80 + 18 + 80 + 12 = 160 + 30 = 190 32 • 2 – 17 • 3 = 30 • 2 + 2 • 2 – (10 • 3 + 7 • 3) = 60 + 4 – (30 + 21) = 64 – 51 = 13