Question

 

tìm x:

 

a) \(\frac{x}{4}\) = \(\frac{16}{128}\)     b) \(1\frac{5}{6}\) = \(\frac{-x}{5}\)           c) 4,25 :8 = 3,5 :x

 

giúp mk nhé ngày maimk nnộp rồi 

 

thanks

Answer 1

\(\frac{x}{4}=\frac{16}{128}\)

\(x=\frac{16\times4}{128}\)

\(x=\frac{1}{2}\)

***

\(1^5_6=-\frac{x}{5}\)

\(\frac{x}{5}=-\frac{11}{6}\)

\(x=-\frac{11\times5}{6}\)

\(x=-\frac{55}{6}\)

***

\(4,25\div8=3,5\div x\)

\(\frac{3,5}{x}=\frac{4,25}{8}\)

\(x=\frac{3,5\times8}{4,25}\)

\(x=\frac{112}{17}\)

Answer 2

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

=> \(\frac{17}{4}.\frac{1}{8}=\frac{7}{2}:x\)

=> \(\frac{17}{32}=\frac{7}{2}:x\)

=> \(x=\frac{7}{2}:\frac{17}{32}\)

=> \(x=\frac{7}{2}.\frac{32}{17}=\frac{112}{17}\)

Answer 3

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 

Answer 4

ơn giời các bạn đây r!~
chờ mãi mà ko thấy ai tl, thànk yó các bẹn nhé~