Question

помогите с 81 номером

Answer 1

1) ... = 425*100 + 139*100 = (425 + 139) * 100 = 564 * 100 = 56400
2) ... = 680*40 + 300*40 = (600 +300) * 40= 900 * 40 = 36000
3) ... = 923 * 10 + 77*10 = (923 + 17) * 10 = 940 *10 = 9400