Question

12/4590:1/342
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Answer 1

= (2/765) · 342 = (2/85) · 38 = 76 / 85

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Удачи))

Answer 2

$frac{12}{4590} div frac{1}{342} = frac{12 div 6}{4590 div 6} div frac{1 div 1}{342 div 1} = frac{2}{765} times 342 = frac{2}{85} times 38 = frac{2}{85} times frac{38}{1} = frac{2 times 38}{85 times 1} = frac{76}{85}$