Дам 15 баллов за правильные ответы

$(1) \: \frac{1}{5} \: and \: \frac{1}{25}$
$(2) \: \frac{3}{8} \: (otvet \: 2) \\$
$(3) \: \frac{15}{150} = \frac{1}{10} \\$
$(4) \frac{2}{3} + \frac{1}{6} + \frac{1}{4} = \\ = \frac{8 + 2 + 3}{12} = \frac{13}{12} = 1 \frac{1}{12} \\$
$(5)1 - ( \frac{1}{3} + \frac{2}{9} ) = \\ = 1 - ( \frac{3 + 2}{9} ) = \frac{4}{9} \\$

(6) А-3 ; Б-1; В-4

$\frac{18}{35} \times \frac{7}{6} = \frac{21}{35} = \frac{3}{5} \\ 2 \frac{2}{5} \div \frac{3}{10} = \frac{12}{5} \times \frac{10}{3} = 8 \\ (1 \frac{1}{4} ) ^{2} = ( \frac{5}{4} ) ^{2} = \frac{25}{16} = 1 \frac{9}{16}$