Question

Помогите пожалуйста со всеми номерами, дам 20б

Answer 1

$1)18 times frac{1}{81} - 20 times frac{1}{9} = - 2 \ 18 times frac{1}{81} = frac{6}{27}$
$20 times frac{1}{9} = frac{20}{9} = 2 frac{2}{9}$
$frac{6}{27} - 2 frac{2}{9} = frac{6}{27} - 2 frac{6}{27} = - 2$
2)
$frac{4}{25} + 3 frac{3}{4} = frac{16}{100} + 3 frac{75}{100} = 3 frac{91}{100}$
3)
$1 frac{1}{2} - 1 frac{4}{5} = 1 frac{5}{10} - 1 frac{8}{10} = - frac{3}{10} = \ = - 0.3$
4)
$4)2 frac{3}{8} + frac{11}{12} = 2 frac{9}{24} + frac{22}{24} = 2 frac{31}{24} = \ = 3 frac{7}{24}$
$3 frac{7}{24} div frac{5}{48} = frac{79}{24} times frac{48}{5} = \ frac{79 times 2}{5} = frac{158}{5} = 31.6$
5)
$frac{12}{20 times 3} = frac{1}{5}$
6)