Question

VA ROGGG URGENT DAU COROANA ​

Answer 1

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

$\frac{5a}{6} = \frac{b}{2} = \frac{5c}{7} = k$

=>

$a = \frac{6k}{5}$

$b = 2k$

$c = \frac{7k}{5}$

$\frac{6k}{5} + 2k + \frac{7k}{5} = 6302$

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)

$\frac{a}{2} = \frac{b}{5} = k$

=> a = 2k , b = 5k

$\frac{b}{10} = \frac{c}{7}$

=> 10c = 7b

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

$c = \frac{7k}{2}$

a+b+c =420

$2k + 5k + \frac{7k}{2} = 420$

$7k + \frac{7k}{2} = 420$

14k + 7k = 840

21k = 840 => k = 40

a = 80

b = 200

c = 140