Odpowiedź:
Szczegółowe wyjaśnienie:
a) 19/25 + 0,4 = 38/50 + 4/10 = 38/50 + 20/50 = 58/50 = 1 8/50 = 1 4/25
b) 3 1/6 + 1,4 = 19/6 + 14/10 = 19/6 + 7/5 = 95/30 + 42/30 = 137/30 = 4 17/30
c) 3,7 - 1 4/25 = 37/10 - 14/25 = 185/50 - 28/50 = 157/50 = 3 7/50
d) 4 1/7 - 2,5 = 29/7 - 25/10 = 29/7 - 5/2 = 58/14 - 35/14 = 23/14 = 1 9/14
e) 3/7 * 0,28 = 3/7 * 28/100 = 3/7 * 7/25 = 3/25
f) 2,5 * 1 3/5 = 5/2 * 8/5 = 8/2 = 4
g) 4,9 : 1 2/5 = 49/10 : 7/5 = 49/10 * 5/7 = 7/2 = 3 1/2
h) 2 1/3 : 2,1 = 7/3 : 21/10 = 7/3 * 10/21 = 10/9 = 1 1/9
