Răspuns:
♧l.
1. a) 7/30
b) 15/36
2. a) D=l•C+R c1, c2=câturi
n=18•c1+13=7•c2+6
n-13=18•c1=7•c2-7
n-13=18•c1=7•(c2-1)
18•7=126
nr. cel mai mic n=126+13=139
b) 2a+3b+c=36
a+b+c=16
5a+5b+5c=80
2a+3b+c+5a+5b+5c=7a+8b+6c=36+80=116
3. a) 15,6+125,34=140,94
b) 100-34,82=65,18
c) 2,5•3,45=8,625
