Question

40 баллов даю 1 и 2.

Answer 1

$2) - 5 times frac{3}{10} b = - frac{5 times 3}{10}b = - frac{3}{2} b$
$4) - 8c times ( - frac{3}{4}d) = frac{8c times 3}{4}d = 6cd$