Question

5 va rog trebuie sa gasesti x

Answer 1

Răspuns:

a)

$\frac{x}{15}$ = $\frac{3}{5}$

5 * x = 15 * 3

5x=45

x=45/5

x=9

b)

$\frac{18}{12}$ = $\frac{2x+1}{10}$

18 * 10 = 12 * ( 2x+1 )

180 = 24x+12

24x=168

x=168/24

x=7

c)

$\frac{x+1}{16}$ = $\frac{5}{8}$

8 * ( x+1 ) = 16 * 5

8x+8=80

8x = 72

x=9

d)

$\frac{3}{2}$ = $\frac{2x+1}{6}$

3 * 6 = 2 * ( 2x+1 )

18 = 4x + 2

4x = 16

x = 4

e)

$\frac{12}{x+2}$ = $\frac{9}{6}$

12 * 6 = ( x+2 ) * 9

72 = 9x + 18

9x = 54

x = 6

Sper ca ai inteles! :D