(5,7/0,3-8 целых 1/3)*0,75
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(2 целых 1/8+1,75)/15,5

выполнить действия

(19- 8 1/3) * 0,75= --------------------------- = (17/8 + 175/100) / 15,5 10 2/3 * 75/100---------------------------- = (17/8 + 7/4) / 15,5 32/3 * 3/4------------------------------ = (17/8 + 14/8) / 155/10 8--------------------- =31/8 * 10/155 8---------------- = 5/4*5 8--------- = 8*4 = 32 1/4