Question

$(0,9- frac{9}{20})*1 frac{7}{13} + frac{4}{5}/2,6$

Answer 1

(9/10 - 9/20) * 20/13 + 4/5 / 26/10 = (18/20 - 9/20) * 20/13 + 4/5 / 13/5 = 9/20 * 20/13 + 4/5 * 5/13 = 9/13 + 4/13 = 13/13 = 1

Answer 2

9/10= (9*2)/(10*2)=18/20