Решите уравнения: 8x=-16, -25x=10, 2x=0,64, 0,3x=-2,7, -2\5x=3\10, 8x-5=x-40, 7x+21=x-3, 0,3x-5=6-0,7x, 3x+5=5x=13.Решение.

Решение: 1. 8x = - 16;х = - 16 / 8;х = - 2. 2. -25x = 10;х = 10 / (-25);х = 0,4. 3. 2x = 0,64;х = 0,64 / 2;х = 0,32. 4. 0,3x = -2,7;х = - 2,7 / 0,3;х = - 9. 5. -2/5x = 3/10;х = 3/10 * (-2/5);х = - 6/50. 6. 8x - 5 = x - 40;8х - х = 5 - 40;7х = - 35;х = - 35 / 7;х = - 5. 7. 7x + 21 = x - 3;7х - х = - 3 - 21;6х = - 24;х = - 24 / 6;х = - 4. 8. 0,3x - 5 = 6 - 0,7x;0,3х + 0,7х = 6 + 5;х = 11. 9. 3x + 5 = 5x - 13;3х - 5х = - 13 - 5;- 2х = - 18;х = (-18)/(-2);х = 9.Ответ: х = - 2; х = 0,4; х = 0,32; х = - 9; х = - 6/50; х = - 5; х = - 4; х = 11; х = 9.