Question

Допоможіть, будь ласка, 6 клас "(8-х):3/4= 17/9:8/21" даю 90 б

Answer 1

В решении

Пошаговое объяснение:

$(8 - x) \div \frac{3}{4} = \frac{17}{9} \div \frac{8}{21} \\ 8 - x = \frac{ \frac{3}{4} \times \frac{17}{9} }{ \frac{8}{21} } \\8 - x = \frac{17}{4} \times \frac{7}{8} \\8 - x = \frac{119}{32} \\ x = 8 - \frac{119}{32} \\ x = \frac{137}{32}$

Answer 2

$(8-x):\dfrac{3}{4} =\displaystyle\frac{17}{9} :\frac{8}{21} \\(8-x)*\frac{4}{3} =\frac{17}{9} *\frac{21}{8} \\\frac{32}{3} -\frac{4}{3} x=\frac{17}{3} *\frac{7}{8} \\\frac{32}{3} -\frac{4}{3} x=\frac{119}{24} ~~~~~~~~~\bigg|*24\\256-32x=119\\-32x=119-256\\-32x=-137\\x=\frac{137}{32} =4\frac{9}{32} =4,28125$