Question

СРОЧНО СРОЧНО СРОЧНО ​

Answer 1

$x = - 0.25 \\ x = - \frac{25}{100} = - \frac{1}{4}$

$- 4(x - 2) + 2(6x - 1) = - 4x + 8 + 12x - 2 = 8x + 6$

$8 \times - ( \frac{1}{4} ) + 6 = - \frac{8}{4} + 6 = - 2 + 6 = 4$

$15( \frac{2}{5} a - \frac{1}{3} b) - 18( - \frac{2}{9}b - \frac{1}{18} a) = \frac{30}{5} a - \frac{15}{3} b + \frac{36}{9} b + \frac{18}{18} a = 6a - 5b + 4b + a = 7a - b$

$7 \times ( - 12) - 0.5 = - 84 - 0.5 = - 84.5$

1) 5(a-2,4)-7(-a+1,2)=5a-12+7a-8,4=12a-20,4

2) -4(2,3a-b)+4,2(-b-3,5a)= -9,2a +4b -4,2b -14,7a = -23,9a - 0,2b