Question

Tìm số nguyên x biết 

a,541 + ( 218 - x) = 735

b, ( 5x - 75 ) : 2 - 84 = 201

c, ( 2x + 2⁵ ) . 8²⁴ = 8²⁶

 

Answer 1

a, x=24

       c, x=16

Answer 2

a) 541 + ( 218 - x ) = 735

   218 - x = 735 - 541

   218 - x = 194

   x = 218 - 194

   x = 24

Vậy x = 24

b) ( 5x - 75 ) : 2 - 84 = 201

    ( 5x - 75) : 2 = 201 + 84

    ( 5x - 75 ) : 2 =285

     5x - 75 = 285 x 2

     5x - 75 =570

     5x = 570 + 75

      5x = 645

      x= 645 : 5

      x= 129

Vậy x =  129

c) ( 2x + 2⁵ ) . 8²⁴ = 8²⁶

    2x + 32  = 8²⁶ : 8²⁴

    2x + 32  = 8²

    2x + 32 = 64

    2x = 64 - 32

    2x = 32

    x = 32 : 2

     x = 16

Vậy x = 16

Answer 3

a, 541 + ( 218 -x ) = 735

( 218 - x ) = 735 - 541

218 - x = 194

x = 218 - 194

x = 24

b, ( 5x - 75 ) : 2 - 84 = 201

( 5x - 75 ) : 2 = 201 + 84

( 5x - 75 ) : 2 = 285

( 5x - 75 ) = 285 . 2

5x - 75 = 570

5x = 570 + 75

5x = 645

x = 645 : 5

x = 125

c, ( 2x + 2⁵ ) . 8²⁴ = 8²⁶

( 2x + 2⁵ ) = 8²⁶ : 8²⁴

 2x + 2⁵ = 8²

 2x + 2⁵ = 2⁶

2x = 2⁶ - 2⁵

2x = 2

x = 2 : 2

x = 1