Найдите значение выражения при a=-0.7 b=2 - 12b (1/4-a) - 6a (2b-1/3)

-12 * b * (1/4 - a) - 6 * a * (2 * b - 1/3); при а = - 0,7 и b = 2.

-12 * 2 * (1/4 - (-0,7)) - 6 * (-0,7) * (2 * 2 - 1/3) = 38,2.

1) 1/4 - (-0,7) = 1/4 + 7/10 = (1 * 5) / (4 * 5) + (7 * 2) / (10 * 2) = 5/20 + 14/20 = 19/20;

2) 2 * 2 = 4;

3) 4 - 1/3 = 3 3/3 - 1/3 = 3 2/3;

4) - 12 * 2 = - 24;

5) - 24 * 19/20 = (-24 * 19) / 20 = - 456/20 = 114/5 = 22,8;

6) 6 * (-0,7) = - 4,2;

7) - 4,2 * 3 2/3 = - 42/10 * 11/3 = - 21/5 * 11/3 = (-21 * 11) / 15 = - 231/15 = - 15,4;

8) 22,8 - (-15,4) = 22,8 + 15,4 = 38,2.