40 = 2³ · 5; 75 = 3 · 5²; НОК = 2³ · 3 · 5² = 600 - общ. знаменатель
600 : 40 = 15 - доп. множ. к 28/40 = 420/600
600 : 75 = 8 - доп. множ. к 10/75 = 80/600
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28/40 - 10/75 = 420/600 - 80/600 = 340/600 = 17/30.
Ответ: 17/30.
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40 = 2³ · 5; 75 = 3 · 5²; НОК = 2³ · 3 · 5² = 600 - общ. знаменатель
600 : 40 = 15 - доп. множ. к 28/40 = 420/600
600 : 75 = 8 - доп. множ. к 10/75 = 80/600
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28/40 - 10/75 = 420/600 - 80/600 = 340/600 = 17/30.
Ответ: 17/30.