(5, 625 ×1 1/3- 3 11/18 ÷ 5/9): 1 2/3=
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(5,625 * 1 1/3 - 3 11/18 : 5/9) : 1 2/3 = 0,61) 5,625 * 1 1/3 = 5 5/8 * 1 1/3 = 45/8 * 4/3 = (15*1)/(2*1) = 15/2 = 7 1/22) 3 11/18 : 5/9 = 65/18 * 9/5 = (13*1)/(2*1) = 13/2 = 6 1/23) 7 1/2 - 6 1/2 = 14) 1 : 1 2/3 = 1 : 5/3 = 1 * 3/5 = 3/5 = 0,6Ответ: 3/5 или 0,6 (в десятичных дробях).Пояснения:0,625 = 625/1000 = 5/8 - сократили на 1251 целая 1/3 = (1*3+1)/3 = 4/33 целых 11/18 = (3*18+11)/18 = 65/181 целая 2/3 = (1*3+2)/3 = 5/33/5 = 6/10 = 0,6