Răspuns :
P = 2 * (L + l) = 110 (cm) L = ? si l = ?
dacă
L / 3 = l - 3 | * 3
L = 3*l - 9
_________
↓
2*(L + l) = 110
3*l - 9 + l = 110:2
4*l = 55 + 9
l = 64;4=16
R: l = 16 cm si L = 3*16 - 9 = 39 cm .
dacă
L / 3 = l - 3 | * 3
L = 3*l - 9
_________
↓
2*(L + l) = 110
3*l - 9 + l = 110:2
4*l = 55 + 9
l = 64;4=16
R: l = 16 cm si L = 3*16 - 9 = 39 cm .
P = 2(L + l)
³⁾l = L/3 + ³⁾3
3 l = L + 9
L = 3 l - 9
110 = 2(3 l - 9 + l) | : 2
55 = 4 l - 9
4 l = 55 + 9
l = 64 : 4
l = 16 cm latimea
L = 3 * 16 - 9
L = 39 cm lungimea
³⁾l = L/3 + ³⁾3
3 l = L + 9
L = 3 l - 9
110 = 2(3 l - 9 + l) | : 2
55 = 4 l - 9
4 l = 55 + 9
l = 64 : 4
l = 16 cm latimea
L = 3 * 16 - 9
L = 39 cm lungimea