Odpowiedź :
a) 0,1 + 3/4 = 1/10 + 3/4 = 4/40 + 30/40 = 34/40 = 17/20
b) 2/3 - 0,3 = 2/3 - 3/10 = 20/30 - 9/30 = 11/30
c) 1/2 + 0,418 = 0,5 + 0,418 = 0,918
d) 4/7*0,3 = 4/7*3/10 = 12/70 = 6/35
e) 2 1/4 : 0,3 = 9/4*10/3 = 90/12 = 15/2
f) 0,4 : 3/4 = 4/10*4/3 = 16/30 = 8/15