Question

математика 5 класс 693 плиз

Answer 1

$frac{frac{2}{3} }{ frac{4x}{9} - frac{4}{9} } + frac{1}{20} = frac{4}{5} \ frac{frac{2}{3} }{ frac{4x}{9} - frac{4}{9} } = frac{4}{5} - frac{1}{20} \ frac{frac{2}{3} }{ frac{4x}{9} - frac{4}{9} } = frac{3}{4} \ frac{4x}{9} - frac{4}{9} = frac{2 times 4}{3 times 3} \ frac{4x}{9} - frac{4}{9} = frac{8}{9} \ frac{4x}{9} = frac{8}{9} - frac{4}{9} \ frac{4x}{9} = frac{4}{9} \ 4x times 9 = 9 times 4 \ 36x = 36 \ x = 1$
Ответ: 1