Răspuns:
2/3·(⁴⁾1/6+5/24)=2/3·(4/24+5/24)=2/3·9/24=18/72=1/4
inmultim fractia 2/3 cu fiecare membru din paranteza
2/3·1/6+2/3·5/24=⁴⁾1/9+5/36=4/36+5/36=9/36=1/4
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1/7·(⁶⁾7/15+⁵⁾3/18)=1/7·(42/90+15/90)=1/7·57/90=57/630
1/7·7/15+1/7·3/18=⁴²⁾1/15+⁵⁾3/126=42/630+15/630=57/630
