Решите: 1) - 9 (-1+x) = x-10 2) - 3 (1+10x) = 10x+3 3) 9-2 (3-4x) = -2x+1 4) 9+2 (3-4x) = 3x-3 5) 3 (10-7x) - x=-3

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2 июля, 07:56

Решите: 1) - 9 (-1+x) = x-10 2) - 3 (1+10x) = 10x+3 3) 9-2 (3-4x) = -2x+1 4) 9+2 (3-4x) = 3x-3 5) 3 (10-7x) - x=-3

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Семён Архипов · Answer 1

1) - 9 ( - 1 + x) = x - 10;

9 - 9x = x - 10;

- 9x - x = - 10 - 9;

- 10x = - 19;

x = - 19 : ( - 10);

x = 1.9.

2) - 3 (1 + 10x) = 10x + 3;

- 3 - 3 * 10x = 10x + 3;

- 9 + 30x = 10x - 3;

30x - 10x = - 3 + 9;

20x = 6;

x = 6/20 = 3/10;

x = 0.3;

3) 9 - 2 (3 - 4x) = - 2x + 1;

9 - 6 + 8x = - 2x + 1;

8x + 2x = 1 - 9 + 6;

10x = - 2;

x = - 2/10 = - 1/5;

x = - 0.2

4) 9 + 2 (3 - 4x) = 3x - 3;

9 + 6 - 8x = 3x - 3;

- 8x - 3x = - 3 - 9 - 6;

- 11x = - 18;

x = - 18 : ( - 11);

x = 18/11

x = 1 7/11;

5) 3 (10 - 7x) - x = - 3;

30 - 21x - x = - 3

- 22x = - 33;

x = 33/22 = 3/2;

x = 1.5