Tìm x sao cho a, x+1234+3012=4724 b, x:7.34=8704 c, x-61+75=548 d, 38934:x.4=84

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1. a, x+1234+3012=4724

    x + 4246            =4724

             x                =4724 – 4246

            x                 = 478 

   Vậy x = 478

   b, x:7.34=8704

   x : 7        = 8704: 34

   x:7          = 256

   x              = 256. 7

   x             = 1792

   Vậy x= 1792

   c, x-61+75=548

   x – 61        =  548 – 75

   x -61          = 473

   x                 = 473 + 61

   x                  = 534

   Vậy x = 534

   d, 38934:x.4=84

      38934: x    = 84: 4 

      38934: x      = 21

                  x        = 38934: 21

                 x          = 1854

   Vậy x= 1854

   #No coppy

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2. $\text{a) x + 1234 + 3012 = 4724.}$

   $\text{⇒ x + 4246 = 4724.}$

   $\text{⇒ x = 4724 – 4246.}$

   $\text{⇒ x = 478.}$

   $\text{Vậy x = 478.}$

   $\text{b) x ÷ 7 × 34 = 8704.}$

   $\text{⇒ x ÷ 7 = 8704 ÷ 34.}$

   $\text{⇒ x ÷ 7 = 256.}$

   $\text{⇒ x = 256 × 7.}$

   $\text{⇒ x = 1792.}$

   $\text{Vậy x = 1792.}$

   $\text{c) x – 61 + 75 = 548.}$

   $\text{⇒ x – 61 = 548 – 75.}$

   $\text{⇒ x – 61 = 473.}$

   $\text{⇒ x = 473 + 61.}$

   $\text{⇒ x = 534.}$

   $\text{Vậy x = 534.}$

   $\text{d) 38934 ÷ x × 4 = 84.}$

   $\text{⇒ 38934 ÷ x = 84 ÷ 4.}$

   $\text{⇒ 38934 ÷ x = 21.}$

   $\text{⇒ x = 38934 ÷ 21.}$

   $\text{⇒ x = 1854.}$

   $\text{Vậy x = 1854.}$

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