Й) 4 15/49 - 2 3/14

Й) \( 4\frac{15}{49} - 2\frac{3}{14} = 4\frac{15 · 2}{49 · 2} - 2\frac{3 · 9}{14 · 9} = 4\frac{30}{98} - 2\frac{27}{126} \) (common denominator for 49 and 14 is 98)

\( 4\frac{15}{49} - 2\frac{3}{14} = 4\frac{30}{98} - 2\frac{21}{98} = (4-2) + (\frac{30}{98} - \frac{21}{98}) = 2 + \frac{9}{98} = 2\frac{9}{98} \)