X:9 - 346 = 888
x:9 = 888+346
x:9 = 1234
x = 1234 × 9
x = 11.106
(458297 - x) + 90687 = 111312
458297 - x = 111312 - 90687
458297 - x = 20625
x = 458297 - 20625
x = 437672
(5/8у - 2 3/4) * 8 = 3
5/8у - 2 3/4 = 3 : 8 = 3/8
5/8у = 3/8 + 2 3/4 = 3/8 + 2 6/8 = 2 9/8 = 25/8
у = 25/8 : 5/8 = 25/8 * 8/5 = 25/5 = 5
у = 5
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Проверка:
(5/8 * 5 - 2 3/4) * 8 = 3
(25/8 - 11/4) * 8 = 3
(25/8 - 22/8) * 8 = 3
3/8 * 8 = 3
3 = 3
НОК (1620;111)=5*2*2*3*3*3*3*37=11840
НОД (1620;111)=3
1620:5=324:2=162:2=81=:3=27:3=9:3=3:3=1
111:3=37:37=1