3 (x-4) + 17 = 2 (3+x) - 4 1/2 (x + 7) + 13 = 1/4 (x+2) - 17 x + 4 / 7 + 8 = 2x-7 / 2 | 7 - X | = 3x + 2 3 - |x+4| = 9 |x - 2| = - 4

Question

Змей

Математика

19 апреля, 08:25

3 (x-4) + 17 = 2 (3+x) - 4 1/2 (x + 7) + 13 = 1/4 (x+2) - 17 x + 4 / 7 + 8 = 2x-7 / 2 | 7 - X | = 3x + 2 3 - |x+4| = 9 |x - 2| = - 4

+4

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Михаил Сидоров · Answer 1

1) 3 (x-4) + 17 = 2;

3 * x - 12 + 17 = 2;

3 * x + 5 = 2;

3 * x = 2 - 5;

3 * x = - 3;

x = - 3 / 3;

x = - 1;

2) (3+x) - 4 = 1/2;

3 + x - 4 = 1 / 2;

x - 1 = 1 / 2;

x = 1 / 2 + 1;

x = 3 / 2;

x = 1.5;

3) (x + 7) + 13 = 1/4;

x + 7 + 13 = 1 / 4;

x + 20 = 1 / 4;

x = 1 / 4 - 20;

x = - 19.75;

4) (x+2) - 17 x + 4 / 7 + 8 = 2x-7 / 2;

x + 2 + 17 * x + 4 / 7 + 8 = 2 * x - 7 / 2;

18 * x + 10 целых 4 / 7 = 2 * х - 7 / 2;

18 * x - 2 * x = - 7 / 2 - 10 целых 4 / 7;

16 * x = - 7 / 2 - 74 / 7;

16 * x = ( - 49 - 148) / 14;

16 * x = - 197 / 14;

x = - 197 / 224;

5) | 7 - X | = 3x + 2;

1. 7 - x = 3 * x + 2;

7 - 2 = 4 * x;

x = 5 / 4;

2. 7 - x = - 3 * x - 2;

- 2 * x = 9;

x = - 9 / 2;

6) 3 - |x+4| = 9;

1. x + 4 = - 6;

x = - 10;

2. x + 4 = 6;

x = 2;

7) |x - 2| = - 4;

1. x - 2 = - 4;

x = - 2;

2. x - 2 = 4;

x = 6.