Question

Помогите пожалуйста ​

Answer 1

Ответ:

1)

$(1-\frac{1}{4} -\frac{3}{8}): \frac{3}{4} - \frac{1}{2} = (\frac{8}{8} - \frac{2}{8} -\frac{3}{8}):\frac{3}{4} - \frac{1}{2} = \frac{3}{8}: \frac{3}{4} - \frac{1}{2} = \frac{3}{8}* \frac{4}{3} - \frac{1}{2} = \frac{4}{8} - \frac{1}{2} = \frac{1}{2}- \frac{1}{2} = 0$

2)АВ = СВ

АВ+СВ+CD = 8

$2*AB + 2\frac{1}{5} = 8\\2*AB = 8-2\frac{1}{5}\\2AB = 5\frac{4}{5} = \frac{29}{5} \\AB = \frac{29}{10} = 2\frac{9}{10} = 2.9$