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.