👤

a+b=27
a=2b
axb:2=??????????


...


Răspuns :

3b=27
b=9
a=18
9x18:2=n.c.


a+b=27
a=2b
=> 2b+b=27
=> 3b=27
=> b=9
=> a=18
=> axb:2=18x9:2=81