Question

Mọi người giúp mình với.

Tìm x biết

a, (44-x)/3=(x-12)/5

b, (3-x)/4=(2x+7)/5

Xin cảm ơn trc nha

 

Answer 1

a, ( 44 - x ) / 3 = ( x - 12 ) / 5

=> 5 ( 44 - x  ) = 3 ( x - 12 )

     220 - 5x     = 3x  - 36

     - 5x - 3x     = - 36 - 220

      - 8 x          = - 256

           x          = 32

b , ( 3 - x ) / 4 = ( 2x + 7 ) / 5

=> 5 ( 3 - x )   = 4 ( 2x + 7 )

     15 - 5x      = 8 x  + 28

     - 5 x - 8 x  = 28 - 15

        - 13 x     = 13

               x     = -1

Answer 2

a, \(\frac{\left(44-x\right)}{3}=\frac{\left(x-12\right)}{5}\)

 => (44 - x) . 5 = (x - 12) . 3

 => 44 - x . 5   = x - 12 .3

 => 44 - x . 5   = x - 36

 => x5 + x        = - 36 - 44

 => x5 + x        = - 80

=> x . (5 + 1)    = - 80

=> x . 6           = - 80

=> x                = - 80 : 6

=> x                = - 13,3

b, \(\frac{\left(3-x\right)}{4}=\frac{\left(2x+7\right)}{5}\)

=> (3 - x) . 5 = (2x + 7) . 4

=> 3 - x . 5   = 2x + 7 . 4

=> 3 - x . 5   = 2x + 28

=> -x . 5 + 2x = 28 - 3

=> -x . 5 + 2x = 25

=>  x . 5 + 2x = 25

=>  x . (5 + 2) = 25

=>  x . 7         = 25

=>  x              = 25 : 7

=>  x              = 3,57

Answer 3

a)(44-x).5=(x-12).3

44.5-x.5=x.3-12.3

220-x.5=x.3-36

220-x.5-x.3=-36

x.5-x.3=220+36

x.(5-3)=256

x.2=256

x=256:2

x=128