1) (3b+2a) ³ 2) (x+y) ² - (x-y) ² 3) (2x-3) ² - (2x+3) ²=12

Разложим на многочлен.

1) (3 * b + 2 * a) ³ = (3 * b) ³ + 3 * (3 * b) ² * 2 * a + 3 * 3 * b * (2 * a) ² + (2 * a) ³ = 27 * b³ + 3 * 9 * b² * 2 * a + 9 * b * 4 * a² + 8 * a³ = 27 * b³ + 54 * b² * a + 36 * b * a² + 8 * a³;

2) (x + y) ² - (x - y) ² = x² + 2 * x * y + y² - (x² - 2 * x * y + y²) = x² + 2 * x * y + y² - x² + 2 * x * y - y² = 2 * x * y + 2 * x * y = 4 * x * y;

3) Найдем корень.

(2 * x - 3) ² - (2 * x + 3) ² = 12;

(2 * x) ² - 2 * 2 * x * 3 + 3² - ((2 * x) ² + 2 * 2 * x * 3 + 3²) = 12;

4 * x² - 12 * x + 9 - (4 * x² + 12 * x + 9) = 12;

4 * x² - 12 * x + 9 - 4 * x² - 12 * x - 9 = 12;

-12 * x - 12 * x = 12;

x * (-12 - 12) = 12;

x * (-24) = 12;

-24 * x = 12;

x = - 12/24;

x = - 1/2;

x = - 0.5.