ПОМОГИТЕ ПОЖАЛУЙСТА

1.
$\frac{8}{81} \times \frac{9}{32} = \frac{1}{36}$
2.
$\frac{3}{16} \div 4 \frac{1}{8} = \frac{3}{16} \div \frac{33}{8} = \frac{3}{16} \times \frac{8}{33} = \\ = \frac{1}{6}$
3.
$x = \frac{15}{23} \times \frac{7}{15} = \frac{7}{23}$
4.
$x = 12 \div \frac{3}{4} = \frac{12}{1} \times \frac{4}{3} = 16$
5.
$99 \times \frac{8}{9} = \frac{99}{1} \times \frac{8}{9} = 88$
6.
$30 \div \frac{2}{3} = \frac{30}{1} \times \frac{3}{2} = 45$