Tìm x biết a.( x + 53)- 123=100 b.3636 :(12.x – 91)=36

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1. a, $(x+53)-123=100$

    $x+53=100+123$

   $x+53=223$
   $x=223-53$

   $x=170$

   Vậy $x=170$

   b, $3636:(12.x-91)=36$

   $12.x-91=3636:36$

   $12.x-91=101$

   $12.x=101+91$

   $12.x=192$

   $x=192:12$

   $x=16$

   Vậy $x=16$

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2. a.( x + 53)- 123=100

   ( x + 53) = 100 + 123

    x + 53 = 223

   x = 223 – 53

   x= 170

   b.3636 :(12.x – 91)=36

   (12.x – 91) = 3636 : 36

   12.x – 91 = 101 

   12.x = 101 +91

   12.x = 192

   x= 192 :12 

   x= 16

    

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