Răspuns :
a+b=90
a:b=2r15=>a=2b+15
2b+15+b=90
3b=90-15
b=75:3
b=25
a=2x25+15=65
ab=25x65=1625
a:b=2r15=>a=2b+15
2b+15+b=90
3b=90-15
b=75:3
b=25
a=2x25+15=65
ab=25x65=1625