Question

СРОЧНО!!!!!!!!!!!!!!!!!!! ДАЮ 45 баллов

Answer 1

Ответ:

1.

2

2b/8

7c×d²

8b/a

2.

b/a

5/c

Answer 2

$3)\\\frac{8m}{n}:\frac{4m}{n}=\frac{8m}{n}*\frac{n}{4m}=2\\\frac{3b}{8} :b=\frac{3b}{8b}=\frac{3}{8}=0,375\\\frac{7c^2}{d}:\frac{c}{d^3}=\frac{7c^2}{d}* \frac{d^3}{c}=7cd^2\\\frac{6a}{5b}:\frac{3a^2}{20b^2}= \frac{6a}{5b}*\frac{20b^2}{3a^2}=\frac{8b}{a}\\\\4)\\ \frac{a-b}{7a}:\frac{a-b}{7b}=\frac{a-b}{7a}*\frac{7b}{a-b}=\frac{b}{a}\\\frac{c-5}{c^2-4c}:\frac{c-5}{5c-20}= \frac{c-5}{c^2-4c}*\frac{5c-20}{c-5}=\frac{5c-20}{c^2-4c}=\frac{5(c-4)}{c(c-4)}=\frac{5}{c}$