Question

СРОЧНОООО даю 35балов​

Answer 1

1) а) -3,6 б) 1/12

$- 1.2 \times 3a = - 3.6a$

$- \frac{4}{15} x \times \frac{5}{16} ( - y) = \frac{4 \times 5}{15 \times 16} xy = \frac{1}{12} xy$

2)

$8.4k + 2m - 3n - 18.3k + 3n + 7 m= (8.4 - 18.3)k + (2 + 7)m + ( - 3 + 3)n = - 9.9k + 9m$

3)

$2.5a - 2.5b = 2.5(a - b) \\ 0.2m + 2n = 0.2(m + 10n)$