1) 1,8x-6x+7=7-6x 2) 1,5-2x-3=6-0,5 3) 5-2 (3x+11) = 7 4) 2x - (3x+5) = -5 5) 10 (0,3x+0,4) = 1 6) 1-5 (2-x) = 2+7x-9 7) 3-4 (2x-5) = 23-8x

Question

Даниил Поляков

Математика

18 февраля, 18:12

1) 1,8x-6x+7=7-6x 2) 1,5-2x-3=6-0,5 3) 5-2 (3x+11) = 7 4) 2x - (3x+5) = -5 5) 10 (0,3x+0,4) = 1 6) 1-5 (2-x) = 2+7x-9 7) 3-4 (2x-5) = 23-8x

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Алексей Головин · Answer 1

1) 1,8x - 6x + 7 = 7 - 6x;

1,8x - 6x + 6x = 7 - 7;

x (1.8 - 6 + 6) = 0;

1.8x = 0;

x = 0;

2) 1,5 - 2x - 3 = 6 - 0,5;

-2x = 6 - 0.5 - 1.5 + 3;

-2x = 7;

x = 7 : (-2);

x = - 3.5;

3) 5 - 2 (3x + 11) = 7;

5 - 2 * 3x - 2 * 11 = 7;

5 - 6x - 22 = 7;

-6x = 7 + 22 - 5;

-6x = 24;

x = 24 : (-6);

x = - 4;

4) 2x - (3x + 5) = - 5;

2x - 3x - 5 = - 5;

2x - 3x = - 5 + 5;

x (2 - 3) = 0;

-x = 0;

x = 0;

5) 10 (0,3x + 0,4) = 1;

10 * 0.3x + 10 * 0.4 = 1;

3x + 4 = 1;

3x = 1 - 4;

3x = - 3;

x = - 3 : 3;

x = - 1.

6) 1 - 5 (2 - x) = 2 + 7x - 9;

1 - 5 * 2 + 5 * x = 2 + 7x - 9;

1 - 10 + 5x = 2 + 7x - 9;

5x - 7x = 2 - 9 - 1 + 10;

-2x = 2;

x = 2 : (-2);

x = - 1.