a)1/2*7/10= 7/20
b) 4/18:5/100= 2/9*100/5=40/90= 4 i 4/9
c) 125/100*1/8= 125/800= 5/32
d) 4 i 1/2 + 2,75= 9/2+ 2 i 75/100= 9/2+ 275/100= 450/100+275/100= 725/100= 7 i 1/4
e) 2/3-3/10= 20/30-9/30= 11/30
f) 3 i 2/5 + 2 i 15/100= 17/5+ 43/20= 68/20+ 43/20= 111/20= 5 i 11/20
g) 3 i 41/100- 2 i 3/4= 341/100- 11/4= 341/100- 275/100= 66/100= 0,66
h) 2/10: 5/7= 2/10*7/5= 14/50= 7/25
