Question

Dau coroana!!! Va rooog am nevoie urgeeeeeeeent!

Answer 1

0,(x) inseamna ca e  x/9  formula generala.  

a+c=5b     a,b(c)+b,c(a)+c,a(b)=13.(3)             , (a;b;c)∈N

a+b/10+c/90 +b+c/10+a/90+c+a/10+b/90=13 +3/9

a+b+c+(a+b+c)/10 +(a+b+c)/90=a+b+c +(a+b+c)/9 =13+3/9   A=5B-C

13,3(3)-2,2(2)=11,(1)   A=C=10

Deci solutiile toate sunt:    

(2;2;8),(3;2;7),(4;2;6),(5;2;5),(6;2;4),(7;2;3) si (8;2;2)      " 7 solutii".

=5b-c+b+c+(5b-c+b+c)/9=13+3/9

6b+6b/9=13+1/3  ⇔ 6b+2b/3 =(13×3+1)/3

(6b×3+2b)/3=(39+1)/3

20b=40     am aflat ca     ⊂⊂⊂⊂⊂║B=2 ║⊃⊃⊃⊃⊃⊃

A+C=10