Question

1/ 5 x 2² + ( x + 3 ) = 5²

2/ 3² x 2 + ( x + 25 ) = 10²

3/ 2³ x 5 - ( x + 3² ) = 10

4/ 7² - 7 x ( 13 - x ) = 14

5/ 14x - 2 x 7² = 2 x 3 x 7

 

Answer 1

1 / 5 x 2 ² + ( x + 3 ) = 5 ²

     20  +      ( x + 3 ) = 25

                     x + 3   = 5

                          x    = 2

2 / 3 ² x 2 + ( x + 25 ) = 10 ²

     18       + ( x + 25 ) = 100

                     x  + 25  = 82

                            x    = 57

3 / 2 ³ x 5 - ( x + 3 ² ) = 10

     40       - ( x + 9 )   = 10

                    x + 9     = 30

                         x      = 21

4 / 7 ² - 7 x ( 13 - x ) = 14

     49 - 7 x ( 13 - x ) = 14

           7 x ( 13 - x )  = 35

                    13 - x   = 5

                          x    = 8

5 / 14 x - 2 x 7 ² = 2 x 3  x 7

     14 x - 98       = 42

     14 x              = 140

          x              = 10

Answer 2

1/ 5 x 2² + ( x + 3 ) = 5²

2/ 3² x 2 + ( x + 25 ) = 10²

3/ 2³ x 5 - ( x + 3² ) = 10

4/ 7² - 7 x ( 13 - x ) = 14

5/ 14x - 2 x 7² = 2 x 3 x 7

1 / 5 x 2 ² + ( x + 3 ) = 5 ²

     20  +      ( x + 3 ) = 25

                     x + 3   = 5

                          x    = 2

2 / 3 ² x 2 + ( x + 25 ) = 10 ²

     18       + ( x + 25 ) = 100

                     x  + 25  = 82

                            x    = 57

3 / 2 ³ x 5 - ( x + 3 ² ) = 10

     40       - ( x + 9 )   = 10

                    x + 9     = 30

                         x      = 21

4 / 7 ² - 7 x ( 13 - x ) = 14

     49 - 7 x ( 13 - x ) = 14

           7 x ( 13 - x )  = 35

                    13 - x   = 5

                          x    = 8

5 / 14 x - 2 x 7 ² = 2 x 3  x 7

     14 x - 98       = 42

     14 x              = 140

          x              = 10

 nhé !