Question

efectuati: b) 3 supra 20+47 supra 180+4 supra 15+7 supra60

Answer 1

$\displaystyle \frac{3}{20} + \frac{47}{180} + \frac{4}{15} + \frac{7}{60} = \frac{3 \cdot 9+47+4 \cdot 12+7 \cdot 3}{180} = \\ \\ = \frac{27+47+48+21}{180} = \frac{143}{180}$

Answer 2

50 supra20+184supra 22 supra 60 egal cu 224 plus 86 310