ЧАСТИНА 1. Вправи 1 - 100 » 59
3 • 4 + 20 = 12 + 20 = 32; 4 • 7 + 12 = 28 + 12 = 40; (11 – 7) • 6 = 4 • 6 = 24; 18 – 4 • 4 = 18 – 16 = 2; 4 • (12 – 5) = 4 • 7 = 28; 4 • (3 • 2) = 4 • 6 = 24.
3 • 4 + 20 = 12 + 20 = 32; 4 • 7 + 12 = 28 + 12 = 40; (11 – 7) • 6 = 4 • 6 = 24; 18 – 4 • 4 = 18 – 16 = 2; 4 • (12 – 5) = 4 • 7 = 28; 4 • (3 • 2) = 4 • 6 = 24.