Вправи 1101 - 1200 » 1179

Обчисли зручним способом: 1) 959 – (159 + 273) = (959 – 159) – 273 = 800 – 273 = 527; 2) (584 + 137) – 484 = (584 - 484) + 137 = 100 + 137 = 237; 3) 781 – (329 + 271) = 781 – 600 = 181; 4) (497 + 382) – 182 = 497 + (382 – 182) = 497 + 200 = 697; 5) (541 + 359) – (137 + 663) = 900 – 800 = 100; 6) (342 + 975) – (775 + 242) = (342 – 242) + (975 – 775) = 100 + 200 = 300.