Question

Упростите выражения

-8(k-3)+4(k-2)-2(3k+1)

5/9(3,6a - 3 3/5b)-3,5(4/7a - 0,2b​)

Answer 1

$- 8k + 24 + 4k - 8 - 6k - 2 = - 10k + 14 \\ \frac{5 \times 36}{9 \times 10} a - \frac{5 \times 18}{9 \times 5} b - \frac{35 \times 4}{10 \times 7} a + \frac{35 \times 2}{10 \times 10} b = \frac{1 \times 4}{1 \times 2} a - \frac{1 \times 2}{1 \times 1} b - \frac{5 \times 2}{5 \times 1} a+ \frac{7 \times 1}{2 \times 5} b = 2 a - 2b - 2a + \frac{7}{10} b = - 2b + 0.7b = - 1.3b$