Odpowiedź:
a) 0,5 + 2/3 = 1/2 + 2/3 = 7/6
2,5 * 2 2/7 = 5/2 * 2 2/7 = 5/2 * 16/7 = 5*8/7 = 40/7
1,8 - 1 2/3 = 9/5 - 1 2/3 = 9/5 - 5/3 = 2/15
2 1/4 : 0,3 = 9/4 : 0,3 = 9/4 : 3/10 =9/4 * 10/3 = 3/4 * 10 = 15/2
b) 4,25 + 1 3/4 = 17/4 + 1 3/4 = 17/4 + 7/4 = 6
3,6 * 3/5 = 18/5 * 3/5 = 54/25
6,5 * 3 1/2 = 13/2 * 3 1/2 = 39/4
2,1/4 ; 0,3 = 21/10/4 : 0,3 = 21/40 ; 3/10 = 7/40 *10 = 7/4
Szczegółowe wyjaśnienie: