a)1•5+2=7/5
2•5+1=11/5
7/5+11/5=18/5
b)10•9+5=95/9
1•9+5=14/9
14/9+95/9=109
c)2•7+1=15/7
3/7+15/7=18/7
d)2•10+1=21/10
3•10+3=33/10
21/10+33/10+6/10=60/10
e)3•2+1=7/2
5•4+1=21/4
[2;4]=4
14/4+21/4=35/4
f)1•4+3=7/4
1/8
[4;8]=8
14/8+1/8=15/8
g) 5•3+2=17/3
1•6+2=8/6
[3;6]=6
34/6+8/6=42/6
j)15•12+5=185/12
8•4+3=35/4
[4;12]=12
105/12+185/12=290/12
k)103•25+1=2576
100•75+3=7503
[25;75]=75
l)91•15+13=1378/15
25•45+1=1126/45
[45;15]=45
1378•45=62010/45
62019/45+1126=63136
Sper că te-am ajutat!
asi dori coronița