Question

Daca a+b+c=99 a=100-50+3 c+a =89,atunci a-b=?

Answer 1

a+b+c=99
a=100-50+3
⇒a=50+3
⇒a=53;
c+a=89
⇒c=89-a
⇒c=89-53
⇒c=36;
b=99-[a+c]
⇒b=99-89
⇒b=10;
⇒a-b=53-10
⇒43;

Answer 2

a=53 deci c+53=89 , atunci c =89-53 c=36 ,deci a+b+c=99 ------ 53+b+36=99 ----- 89+b=99 deci b=10 atunci a-b=53-10=43