Question

calculati: 20-19si1supra3

Answer 1

$20-19* \frac{1}{3} =19* \frac{3}{3} -19* \frac{1}{3} = \frac{2}{3}$

Answer 2

se introduc intregii in fractie:

$19 \frac{1}{3} = \frac{19\cdot3+1}{3} = \frac{57+1}{3} = \frac{58}{3}$

$20-19 \frac{1}{3} =20- \frac{58}{3}= \frac{20\cdot3-58}{3}= \frac{60-58}{3}= \frac{2}{3}$