Question

Tim x

a) ( 12-3x ) :20 =0

b) ( 2x-26 ) : 12 = 25

c) 234 : (5 x + 28 ) = 3

d) 529 : ( 72-7x ) = 23

Answer 1

a) 12-3x=0

    3x=12-0

    3x=12

    x=12:3

    x=4

b)2x-26=25.12

   2x-26=300

   2x=300+26

   2x=326

   x=326:2

   x=163

c)5x+28=234:3

  5x+28=78

  5x=78-28

  5x=50

  x=50:5

  x=10

d)72-7x=529:23

   72-7x=23

   7x=72-23

   7x=49

   x=49:7

   x=7

k cho mình nhoa~~

Answer 2

a, (12-3x):20=0

=> 12-3x=0

=> 3x=12

=> x= 4             Vậy x=4

b, (2x-26):12=25

=> 2x-26=300

=> 2x=326

=> x=163           Vậy x= 163

c, 234:( 5x+28)=3

=> 5x+28=78

=> 5x=50

=> x= 10            Vậy x= 10

d, 529: (72-7x)=23

=> 72-7x=23

=> 7x=49

=> x= 7             Vậy x= 7

   Nhớ k cho mik nhé!!!! CẢM ƠN !!!