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
