X:6,3=2целых 1 седьмая:1,25.КАков x

[latex] \frac{x}{6.3} = \frac{1 \frac{1}{7} }{1.25} \\ \\ x= \frac{6.3*1 \frac{1}{7} }{1.25} = \frac{6.3* \frac{8}{7} }{1.25} = \frac{6 \frac{3}{10}* \frac{8}{7} }{ \frac{125}{100} } = \frac{ \frac{63*8}{10*7} }{ \frac{5}{4} } = \frac{63*8*4}{10*7*5} = \frac{9*4*4}{5*1*5} = \\ \\ = \frac{144}{25} =5.76[/latex]