Question

Ex:4,5

Dau coroana!!!!!

Va rog!!!

Este urgent!!!

Sa fie rezolvate de clasa aIV-a,daca se poate!

Answer 1

4)
5×a + 2×b = 30
ptr a = 0 ==> 2×b = 30 => b = 30:2 = 15
ptr a = 2 ==> 2×b = 30-10 => b = 20:2 = 10
ptr a = 4 ==> 2×b = 30-20 => b = 10:2 = 5

deci solutiile sunt:
a = 0; b = 15
a =2; b = 10
a = 4; b = 5

5)
r + g = 45
r + a = 45
g + a = 42
adunam cele 3 relatii
2×r + 2×g + 2×a = 45+45+42
2×(r + g + a ) = 132
r + g + a = 132 : 2 = 66

r+ g + a = 66
r + g = 45
45 + a = 66
a = 66 - 45
a = 21 (bile albastre)

r + g + a = 66
r + a = 45
45 + g = 66
g = 66 - 45
g = 21 (bile galbene)

r = 66 - (g+a)
r = 66 - (21+21)
r = 66 - 42
r = 24 (bile rosii)

verificare:
21 + 21 + 24 = 66