30,(8) = 30 целых 8/9 = 278/9
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б) 62% = 62/100 = 31/50
30 целых 8/9 - (278/9 * 31/50) = 11 целых 166/225
1) 278/9 * 31/50 = (139*31)/(9*25) = 4309/225 = 19 целых 34/225
2) 30 8/9 - 19 34/225 = 30 200/225 - 19 34/225 = 11 166/225
Ответ: 11 целых 166/225.
Пояснения:
8/9 = (8*25)/(9*25) = 200/225 - доп.множ. 25