Question

Determinati numarul necunoscut din fiecare proportie:

[tex] c) \frac{4x-5}{3} =\frac{2x+8}{2}
\\
\\d) \frac{3x+11}{9} =\frac{x+6}{4}
\\
\\e) \frac{4}{9}=\frac{3x+1}{2x+12}
\\
\\ f) \frac{3}{5x+2} =\frac{7}{2x+15} [/tex]





Ofer puncte ^^ + coronitza

Answer 1

c)

2 ( 4 x - 5 ) = 3 ( 2 x + 8 )

8 x - 10 = 6 x + 24

8 x - 6 x = 24 + 10

2 x = 34

x = 34 : 2

x = 17

____________

d )

4 ( 3 x + 11 ) = 9 ( x + 6 )

12 x + 44 = 9 x + 54

12 x - 9 x = 54 - 44

3 x = 10

x = 10 / 3 = 3 intregi si 1 / 3 = 3,(3)

_______________________________

e)

4 ( 2 x + 12 ) = 9 ( 3 x + 1 )

8 x + 48 = 27 x + 9

8 x - 27 x = 9 - 48

- 19 x = - 39 l : ( - )

x = 39 / 19 = 2 intregi si 1 / 19 = 2,052

________________________________

f )

3 ( 2 x + 15 ) = 7 ( 5 x + 2 )

6 x + 45 = 35 x + 14

35 x - 6 x = 45 - 14

29 x = 31

x = 31 / 29 = 1 intreg si 2 / 29 = 1,068

Answer 2

~*~*~*~*~*~*~*~**~*~*~*~*~*