Question

11 x (x+10) + 10 x (x+6)= 170, 8 x (x-11) = - 11 x (x-3) -273, 4x (6x - 11) +6 x (7x +5) = -14, 6 x (8x +10) +8 x (4x + 6 ) = 268, 11 x (3x - 6 ) - 4 x (10x - 7) = -87, 10 x (10x + 3) + 6 x (2x - 6) = -6, 7 x (x - 8 ) -8 (x+2) = -70, 8 x (6x + 8) - 9 x (12x + 9 ) = -137

Answer 1

Răspuns:

Explicație pas cu pas:

• 11 · (x+10) + 10 · (x+6)= 170

11x + 110 + 10x + 60 = 170

21x + 170 = 170

21x = 170 - 170

21x = 0

x = 0

_________________________

• 8 · (x-11) = - 11 ·(x-3) -273

8x - 88 = - 11x + 33 - 273

8x + 11x = - 240 + 88

19x = - 152

x = ( -152) : 19

x = - 8

________________________

• 4 · (6x - 11) +6 · (7x +5) = -14

24x - 44 + 42x + 30 = - 14

66x - 14 = - 14

66x = - 14 + 14

66x = 0

x = 0

_________________

• 6 · (8x +10) +8 · (4x + 6 ) = 268

48x + 60 + 32x + 48 = 268

80x + 108 = 268

80x = 268 - 108

80x = 160

x = 160 : 80

x = 2

_____________________

• 11 · (3x - 6 ) - 4 · (10x - 7) = -87

33x - 66 - 40x + 28 = - 87

- 7x - 38 = - 87

- 7x = - 87 + 38

- 7x = - 49

x = ( - 49) : ( -7)

x = 7

________________________

• 10 · (10x + 3) + 6 · (2x - 6) = -6

100x + 30 + 12x - 36 = - 6

112x - 6 = - 6

112x = - 6 + 6

112x = 0

x = 0

________________

• 7 · (x - 8 ) -8 (x+2) = -70

7x - 56 - 8x - 16 = - 70

- x - 72 = - 70

- x = - 70 + 72

- x = 2

x = - 2

_______________________________

• 8 · (6x + 8) - 9 · (12x + 9 ) = -137

48x + 64 - 108x - 81 = - 137

- 60x - 17 = - 137

- 60x = - 137 + 17

- 60x = - 120

x = ( -120) : ( -60)

x = 2