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

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