Oblicz ! a) 2/3 *(7 4/20 - 3 3/4) = b) 74/5 -1 1/5 * 2 1/2 = Błagam pomóżcie !  Daje naj naj ;)

2/3 * ( 7 4/20 - 3 3/4) = 2/3 * ( 144/20 - 15/4) = 2/3 * ( 144/20- 75/20) = 2/3 * 69/20 = 138/60 = 2 18/60 = 2 3/10 7 4/5 - 1 1/5 * 2 1/2 = 7 4/5 - ( 6/5 * 5/2) = 7 4/5 - 30/10 = 39/5 - 15/ 5 = 24/5 = 4 4/5