M.A. A,B,C,D= 5
B,C = 5
A, ,D= 5
Stiind ca cele 4 numere < 10... aflati variantele
Media aritmetica...
Media aritmetica...
In all this world there is only one pure and magic thing... and it is called PURPLE!
-
miruna.lazar
- Bernoulli
- Posts: 224
- Joined: Wed Oct 08, 2008 8:41 pm
- Location: Tulcea
Draguta problema , Amaranth !
\( \frac {a+b+c+d}{4}=5 \) => a+b+c+d = 20
\( \frac {b+c}{2}=5 \) => b+c = 10
\( \frac{a+d}{2}=5 \) => a+d = 10
1. a = 1 => d = 9
b = 2 => c = 8
2. a = 1 => d = 9
b = 8 => c = 2
3. a = 2 => d = 8
b= 3 => c = 7
4 . a = 2 => d = 8
b = 7 => c = 3
5. a = 3 => d = 7
b = 4 => c= 6
6. a = 3 => d = 7
b = 6 => c = 4
7. a = 7 => d = 3
b= 6 => c = 4
8. a=7 => d = 3
b= 4 => c = 6
9. a = 8 => d = 2
b = 7 => c = 3
10. a = 8 => d = 2
b = 3 => c = 7
11. a = 9 => d = 1
b = 8 => c= 2
12. a= 9 => d = 1
b =2 => c = 8
\( \frac {a+b+c+d}{4}=5 \) => a+b+c+d = 20
\( \frac {b+c}{2}=5 \) => b+c = 10
\( \frac{a+d}{2}=5 \) => a+d = 10
1. a = 1 => d = 9
b = 2 => c = 8
2. a = 1 => d = 9
b = 8 => c = 2
3. a = 2 => d = 8
b= 3 => c = 7
4 . a = 2 => d = 8
b = 7 => c = 3
5. a = 3 => d = 7
b = 4 => c= 6
6. a = 3 => d = 7
b = 6 => c = 4
7. a = 7 => d = 3
b= 6 => c = 4
8. a=7 => d = 3
b= 4 => c = 6
9. a = 8 => d = 2
b = 7 => c = 3
10. a = 8 => d = 2
b = 3 => c = 7
11. a = 9 => d = 1
b = 8 => c= 2
12. a= 9 => d = 1
b =2 => c = 8