\(\frac{x}{4}=\frac{16}{128}\)
\(x=\frac{16\times4}{128}\)
\(x=\frac{1}{2}\)
***
\(1^5_6=-\frac{x}{5}\)
\(\frac{x}{5}=-\frac{11}{6}\)
\(x=-\frac{11\times5}{6}\)
\(x=-\frac{55}{6}\)
***
\(4,25\div8=3,5\div x\)
\(\frac{3,5}{x}=\frac{4,25}{8}\)
\(x=\frac{3,5\times8}{4,25}\)
\(x=\frac{112}{17}\)
a) \(\frac{x}{4}=\frac{16}{128}=\frac{1}{8}\)
=> 8x = 4
=> x = 4 : 8 \(=\frac{1}{2}\)
b) \(1\frac{5}{6}=\frac{-x}{5}\)
=> \(\frac{11}{6}=\frac{-x}{5}\)
=> 11.5 = -x.6
=> 55 = x.(-6)
=> \(x=\frac{55}{-6}=-\frac{55}{6}\)
c) 4,25 : 8 = 3,5 : x
=> \(\frac{17}{4}.\frac{1}{8}=\frac{7}{2}:x\)
=> \(\frac{17}{32}=\frac{7}{2}:x\)
=> \(x=\frac{7}{2}:\frac{17}{32}\)
=> \(x=\frac{7}{2}.\frac{32}{17}=\frac{112}{17}\)
a)
\(\frac{x}{4}=\frac{16}{128}\)
\(\Rightarrow128x=64\)
\(\Rightarrow x=\frac{1}{2}\)
Vậy \(x=\frac{1}{2}\)
b)
\(1\frac{5}{6}=\frac{-x}{5}\)
\(\Rightarrow\frac{11}{6}=-\frac{x}{5}\)
\(\Rightarrow-6x=55\)
\(\Rightarrow x=-\frac{55}{6}\)
Vậy \(x=-\frac{55}{6}\)
c)
\(4,25:8=3,5:x\)
\(\Rightarrow4,25.x=8.3,5\)
\(\Rightarrow4,25.x=28\)
\(\Rightarrow x=\frac{112}{17}\)
Vậy \(x=\frac{112}{17}\)
Chúc bạn hok tốt 
ơn giời các bạn đây r!~
chờ mãi mà ko thấy ai tl, thànk yó các bẹn nhé~
