Răspuns:
Salut
a)2,75-3+1,25+4,87+3+0,13=
2,75+1,25+4,87+0,13=
9.
b)(1 2/3•5/7)•(3/2•5/7)•3/5=
10/21•15/14•3/5=
2/7•15/14=
1/7•15/7=
15/49.
==evergreen==