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VA ROGGG URGENT DAU COROANA ​

VA ROGGG URGENT DAU COROANA class=

Răspuns :

Răspuns:

3.

a = suma de bani a primului frate

b = suma de bani al celui de al doilea frate

c = suma de bani al celui de al treilea frate

a + b + c = 6302

[tex] \frac{5a}{6} = \frac{b}{2} = \frac{5c}{7} = k[/tex]

=>

[tex]a = \frac{6k}{5}[/tex]

[tex]b = 2k[/tex]

[tex]c = \frac{7k}{5} [/tex]

[tex] \frac{6k}{5} + 2k + \frac{7k}{5} = 6302[/tex]

6k + 10k + 7k = 31510

23k = 31510

k = 1370 =>

a = 1644 lei

b = 2740 lei

c = 1918 lei

4.

a) A(1,a) € Gf => f(1) = a

f(1) = a+2 + a -3

=> a+2+a-3 = a

2a - 1 = a

a = 1

b) f(x) = 3x - 2

5)

[tex] \frac{a}{2} = \frac{b}{5} = k[/tex]

=> a = 2k , b = 5k

[tex] \frac{b}{10} = \frac{c}{7} [/tex]

=> 10c = 7b

b = 5k => 10c = 35k => c = 35k/10

[tex]c = \frac{7k}{2} [/tex]

a+b+c =420

[tex]2k + 5k + \frac{7k}{2} = 420[/tex]

[tex]7k + \frac{7k}{2} = 420[/tex]

14k + 7k = 840

21k = 840 => k = 40

a = 80

b = 200

c = 140

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