Odpowiedź:
A) (3/4-1/5) : 1/2= (15/20-4/20) : 1/2 = 11/20 :1/2 = 11/20 *2/1 = 22/20=11/10= 1 cała i 1/10
c) 2/3 * (1/2 - 1/6) = 2/3 * ( 3/6-1/6) = 2/3 * 2/6 = 4/18 = 2/9
f)123 : 10 + 0,2 * 6,1 = 12,3 + 1,22 = 13,52
g) (6,5-4,7) : (4-21/5) = 65/10 - 47/10) : (20/5- 21/5) = 18/10 : -1/5 = 18/10 * -5/1 = - 18/2 = -9