Решите уравнения 1/x=5/8;1/y=2/7;1/z=2/5;2/x=1/3;3/y=5/6;4/x=8/9 20 баллов за решение...

1) $\frac{1}{x} = \frac{5}{8}$
$\frac{1}{x} = \frac{5}{8},$ x≠0
8=5x
5x=0
x=1.6
2) $\frac{1}{y} = \frac{2}{7}$
$\frac{1}{y} = \frac{2}{7},$ x≠0
7=2x
2x=7
x=3.5
3) $\frac{1}{z} = \frac{2}{5}$
$\frac{1}{z} = \frac{2}{5},$ x≠0
5=2x
2x=5
x=2.5
4) $\frac{2}{x} = \frac{1}{3}$
$\frac{2}{x} = \frac{1}{3},$ x≠0
6=x
x=6
5) $\frac{4}{x} = \frac{8}{9}$
$\frac{4}{x} = \frac{8}{9},$ x≠0
36=8x
8x=36
x=4.5