1) 3(4-5x) = 12 - 15x(6x+4)5 = 30x + 2012 - 15x = 30x + 20-15x - 30x = 20 - 12-45x = 8x = 8 / -45x = -0.17777777778
2) -7(-5+3x) = 35 - 21x(-4-x)3 = -12 - 3x35 - 21x = -12 - 3x-21x + 3x = 35 + 12-18x = 47x = 47 / -18x = -2.61111111111
3) -(3+x) = -3 - x(-5*(-4x+9) = 20x - 45-3 - x = 20x - 45-x - 20x = -45 + 3-21x = -42x = -42 / -21x = 2
4) -5*(-4x-2) = 20x + 10-(3+x) = -3 - x20x + 10 = -3 - x20x + x = -3 - 1021x = -13x = -13 / 21x = -0.61904761905
5) 4(6-3x) = 24 - 12x(-5x+2x)6 = -3x*6 = -18x24 - 12x = -18x-12x + 18x = -246x = -24x = -24 / 6x = -4
6) (3x-4)7 = 21x - 28-11(22*-3) = 24221x - 28 = 24221x = 242 + 2821x = 270x = 270 / 21x = 12.8571428571
7) -3(-5-3x) = 15 + 9x6(-9x-4) = -54x - 2415 + 9x = -54x - 249x + 54x = -24 - 1563x = -39x = -39 / 63x = -0.61904761905
8) (-2x-5)9 = -18x - 45(-1+3x)4 = -4 + 12x-18x - 45 = -4 + 12x-18x - 12x = -4 + 45-30x = 41x = 41 / -30x = -1.36666666667
9) -6(3-x) = -18 + 6x(12-13x)2 = 24 - 26x-18 + 6x = 24 - 26x6x + 26x = 24 + 1832x = 42x = 42 / 32x = 1.3125
10) 2(-4x-7) = -8x - 14-(6x+3)4 = -24x - 12-8x - 14 = -24x - 12-8x + 24x = -12 + 1416x = 2x = 2 / 16x = 0.125
Некоторые ошибки были обнаружены в вашем решении.
1) 3(4-5x) = 12 - 15x
(6x+4)5 = 30x + 20
12 - 15x = 30x + 20
-15x - 30x = 20 - 12
-45x = 8
x = 8 / -45
x = -0.17777777778
2) -7(-5+3x) = 35 - 21x
(-4-x)3 = -12 - 3x
35 - 21x = -12 - 3x
-21x + 3x = 35 + 12
-18x = 47
x = 47 / -18
x = -2.61111111111
3) -(3+x) = -3 - x
(-5*(-4x+9) = 20x - 45
-3 - x = 20x - 45
-x - 20x = -45 + 3
-21x = -42
x = -42 / -21
x = 2
4) -5*(-4x-2) = 20x + 10
-(3+x) = -3 - x
20x + 10 = -3 - x
20x + x = -3 - 10
21x = -13
x = -13 / 21
x = -0.61904761905
5) 4(6-3x) = 24 - 12x
(-5x+2x)6 = -3x*6 = -18x
24 - 12x = -18x
-12x + 18x = -24
6x = -24
x = -24 / 6
x = -4
6) (3x-4)7 = 21x - 28
-11(22*-3) = 242
21x - 28 = 242
21x = 242 + 28
21x = 270
x = 270 / 21
x = 12.8571428571
7) -3(-5-3x) = 15 + 9x
6(-9x-4) = -54x - 24
15 + 9x = -54x - 24
9x + 54x = -24 - 15
63x = -39
x = -39 / 63
x = -0.61904761905
8) (-2x-5)9 = -18x - 45
(-1+3x)4 = -4 + 12x
-18x - 45 = -4 + 12x
-18x - 12x = -4 + 45
-30x = 41
x = 41 / -30
x = -1.36666666667
9) -6(3-x) = -18 + 6x
(12-13x)2 = 24 - 26x
-18 + 6x = 24 - 26x
6x + 26x = 24 + 18
32x = 42
x = 42 / 32
x = 1.3125
10) 2(-4x-7) = -8x - 14
-(6x+3)4 = -24x - 12
-8x - 14 = -24x - 12
-8x + 24x = -12 + 14
16x = 2
x = 2 / 16
x = 0.125
Некоторые ошибки были обнаружены в вашем решении.