Odpowiedź:
2/3 + 0,6 = 2/3 + 6/10 = 20/30 + 18/30 = 38/30 = 1 i 8/30 = 1 i 4/15
4,2 - 1 i 1/9= 4 i 2/10 - 1 i 1/9 = 4 i 1/5 - 1 i 1/9 = 4 i 9/45 - 1 i 5/45 = 3 i 4/45
3,6 - 1 i 1/2 =3 i 6/10 - 1 i 1/2 = 3 i 6/10 - 1 i 5/10 = 2 i 1/10 = 2,1
2 i 1/3 : 0,8 = 7/3 : 8/10 = 7/3 * 10/8 = 70/24 = 2 i 22/24 = 2 i 11/12
5,2 * 2/7 = 52/10 * 2/7 = 52/35 = 1 i 17/35
0,6 : 2/3 = 6/10 : 2/3 = 6/10 * 3/2 = 9/10 = 0,9
2 i 3/20 + 1,27 = 2 i 3/20 + 1 i 27/100 = 2 i 15/100 + 1 i 27/100 = 3 i 42/100= 3 i 21/50
0,65 : 6 i 1/2 = 65/100 : 13/2 = 65/100 * 2/13 = 5/50 = 1/10 = 0,1
4,5 - 3/4 * 1/3 = 45/10 - 1/4 = 90/20 - 5/20 = 85/20 = 4 i 5/20 = 4 i 1/4 = 4,25
(1 i 2/5 + 0,5) : 2 = ( 1,4 + 0,5) :2 = 1,9 : 2 = 0,95
5/8 * 4,2 - (1/4)² = 5/8 * 42/10 - 1/16 = 2 i 10/16 - 1 i 1/16= 2 i 9/16
4/7 * (0,2 - 1/4 ) = 4/7 * (0,2 - 0,25) = 4/7 * (-0,05) = 4/7 * (- 5/100) = -5/175 = -1/35
