Решите все образцы в чёрной рамке пожалуйста

732

по формуле: (a-b) = a - 2ab + b

x = 12x + 36 = x -6x + 9

-12x + 36 = -6x + 9

-12x + 6x = 9 - 36

-6x = 27

x =

x = 4,5

733

по формуле: (a-b) = a - 2ab + b

x - 18x + 81 = x + 8x + 16

-18x + 81 = 8x + 16

-18x - 8x = 16 - 81

-26x = -65

x =

x = 2,5

734

по формуле: (a+b) = a + 2ab + b

x + 4x + 4 = x - 12x + 36

4x + 4 = -12x + 36

4x + 4 = + 12x - 36 = 0

16x - 32 = 0

x - 2 = 0

x = 2

735

по формуле: (a-b) = a - 2ab + b

x - 12x + 36 = x + 14x + 49

-12x + 36 = 14x + 49

-12x - 14x = 49 - 36

-26x = 13

x = -

x = -0,5

736

по формуле: (a+b) = a + 2ab + b

x + 12x + 36 = x + 18x + 81

12x + 36 = 18x + 81

12x - 18x = 81 - 36

-6x = 45

x = -

x = -7,5

737

7-x = x+3

7 - x = x + 3

7 - x = -(x + 3)

x = 2

x

x = 2

738

x-1 = 14-x

x - 1 = 14 - x

x - 1 = -(14 - x)

x =

x

x =

x = 7,5

739

по формуле: (a-b) = a - 2ab + b

x - 14x + 49 = 81 - 18x + x

-14x + 49 = 81 - 18x

-14x = 49 - 81 + 18x = 0

4x - 32 = 0

x - 8 = 0

x = 8

740

по формуле: (a+b) = a + 2ab + b

x + 20x + 100 = 4 - 4x + x

20x + 100 = 4 - 4x

20x + 100 - 4 + 4x = 0

24x + 96 = 0

x + 4 = 0

x = -4

741

x+9 = 10-x

x + 9 = 10 - x

x + 9 = -(10 - x)

x =

x

x =

x = 0,5

742

-2x - 2x + 5 = -x - x - (1 - x)

-2x - 2x + 5 = -x -x - 1 - x

-2x - 2x + 5 = 2x - x - 1

-2x + 5 = -x - 1

-2x + x = - 1 - 5

-x = -6

x = 6

Ответ:

Пошаговое объяснение: