Вправи 601 - 726 » 601

748 – 9 = 748 – 10 + 1 = 739. 512 – 7 = 512 – 2 – 5 = 505. 379742 – 5 = 379737. 4893 + 8 = 4893 + 7 + 1 = 4901. 567859 – 8 + 7 = 567851 + 7 = 567858; 67457 – 9 + 5 = 67457 – 10 + 1 + 5 = 67447 + 6 = 67453.