Question

determine o valor de x nas proporções: 3/4=5x/20 x-5/3=x-1/5 2/x+2=y/10 3x+2/2x-1=16/9

Answer 1

 3/4=5x/20   =>.  20x = 60  = x => 60/20 => x= 3

 

 

x-5/3=x-1/5   => (3x - 5)/3 = (5x - 1)/5

 

15x - 25 = 15x - 3 =>  15x - 15x = - 3 + 25  => 0x = 22    sem solução

 

 

2/x+2=y/10   =>(2 + 2x )/x  = y/10  => 10(2 + 2x) = xy  => 20 + 20x = xy

 

20x - xy = - 20 =>  x( 20 - y) = - 20  => x = - 20/(20 - y)

 

 

3x+2/2x-1=16/9    => 32x -16 27x + 18

 

32x -27x = 18 + 16  => 5x = 34  =>  x = 34/5

 

e fui