Вправи 201 - 300 » 258

Обчисли (усно) найзручнішим способом: 1) 78 – (45 + 18) = (78 – 18) – 45 = 60 – 45 =15; 2) 547 – (20 + 47) = (547 – 47) – 20 = 500 – 20 = 480; 3) 98 – 13 – 28 = (98 – 28) – 13 = 70 – 13 = 57; 4) (400 + 735) – 200 = (400 – 200) + 735 = 200 + 735 = 935; 5) (547 + 329) – 247 = (547 – 247) + 329 = 300 + 329 = 629; 6) 593 – 90 = 503.