Odpowiedź:
Szczegółowe wyjaśnienie:
a) 5/9 + 3/5 =25/45 +27/45=52/45=1 7/45
b) 1 5/6 + 3 1/9 =1 15/18+3 2/18=4 17/18
c) 2 1/10 + 1 7/15 =2 3/30 +1 14/30=3 17/30
d) 3/14 - 1/5 =15/70 -14/70=1/70
e) 2 3/8 - 1 5/6 =2 9/24 -1 20/24=1 33/24 -1 20/24=13/24
f) 3 1/6 - 2 3/4 =3 2/12 -2 9/12=2 14/12 -2 9/12=5/12
g) 8/15 * 5/12 =2/9
h) 2 * 3 3/8 =2*27/8=27/4=6 3/4
i) 1 2/7 * 4/3 =9/7 *4/3=12/7=1 5/7
j) 7/20 * 3 1/3 =7/20*10/3=7/6=1 1/6
k) 1 4/5 * 2 2/9 =9/5*20/9=4