Question

(1/30-5/6)- (- 3,9-2,2)-5,3

Answer 1

(1/30 - 25/30) + 6.1 - 5.3 = -24/30 + 8/10 = -24/30 + 24/30 = 0

Answer 2

$left(frac1{30}-frac56right)-left(-3,9-2,2right)-5,3=\ =left(frac1{30}-frac{5cdot5}{6cdot5}right)-left(-6,1right)-5,3=\ =left(frac{1}{30}-frac{25}{30}right)+6,1-5,3=\ =frac{1-25}{30}+0,8=-frac{24}{30}+0,8=-frac{3cdot8}{3cdot10}+frac{8}{10}=\ =-frac8{10}+frac8{10}=0$