Răspunsuri

2014-11-09T18:04:20+02:00
A=9    b=a-3=9-3=6
a+9·b=9+9·6=9+54=63
9·a-9·b=9·9-9·6=81-54=27
a·b=9·6=54
2014-11-09T18:06:26+02:00
A=9
b=9-3
b=6
a+9xb=9+9x6=9+54=63
9xa-9xb=9x9-9x6=81-54=27
axb=9x6=54