Question

afla necunoscutele. a+b+c=18 a+b=13 b+c=8

Answer 1

a+b+c=18 , a+b=13 , b+c=8 , faci a+b+c=18-a+b=13-->c=5 si scoti din b+c=8 faci b+5=8 si b=3 si a+b=13 , b=3 deci a=13-3=10 , coroana pls