Вправи 301 - 400 » 367

127 + 7 • (4 + 5) = 127 + 7 • 9 = 127 + 63 = 100 + 27 + 63 = 100 + 90 = 190 971 – 3 • (6 + 3) = 971 – 3 • 9 = 971 – 27 = 971 – 21 – 6 = 950 – 6 = 944 30 • 6 + 347 = 180 + 347 = 180 + 320 + 27 = 500 + 27 = 527 50 • 7 – 281 = 350 – 281 = 350 – 250 – 31 = 100 – 31 = 69 40 • 8 – 40 : 8 = 320 – 5 = 315 100 • 10 – 100 : 10 = 1000 – 10 = 990