a) \(3,8:\left(2x\right)=\frac{1}{4}:\frac{8}{3}\)

\(=3,8:\left(2x\right)=\frac{3}{32}\)

\(\Rightarrow2x=3,8:\frac{3}{32}=\frac{608}{15}\)

\(\Rightarrow x=\frac{608}{15}:2=\frac{304}{15}\)

b) Yêu cầu j vậy pn?

\(3,8:\left(2x\right)=\frac{1}{4}:\frac{8}{3}\)

\(\Rightarrow2x=\frac{608}{15}\)

\(\Rightarrow x=\frac{304}{15}\)

\(2x:6=5:3\)                              \(-\frac{2}{x}=-\frac{x}{8}\)

\(\Rightarrow2x:6=\frac{5}{3}\)                          \(\Rightarrow-2\times8=x\times\left(-x\right)\)

\(\Rightarrow2x=\frac{5}{3}\times6\)                      \(\Rightarrow-16=\left(-x\right)^2\)

\(\Rightarrow2x=10\)                               \(\Rightarrow\left(-4\right)^2=\left(-x\right)^2\)

\(\Rightarrow x=5\)                                    \(\Rightarrow x=-4\)

`@` `\text {Ans}`

`\downarrow`

`3,8 * 2x = 1/4*8/3`

`=> 3,8*2x = 2/3`

`=> 2x = 2/3 \div 3,8`

`=> 2x = 10/57`

`=> x = 10/57 \div 2`

`=> x = 5/57`

Vậy, `x = 5/57.`

Mình làm lại theo yc nhé

`3,8 \div 2x = 1/4 \div 8/3`

`=> 3,8*8/3 = 2x*1/4`

`=> 152/15 = 2x*1/4`

`=> 2x = 152/15 \div 1/4`

`=> 2x = 608/15`

`=> x = 608/15 \div 2`

`=> x = 304/15`

Vậy, `x = 304/15.`

b) \(3,8:\left(2x\right)=\frac{1}{4}:\frac{8}{3}\)

= \(3,8:\left(2x\right)=\frac{3}{32}\)

\(\Rightarrow2x=3,8:\frac{3}{32}=\frac{608}{15}\)

\(\Rightarrow x\frac{608}{15}:2=\frac{304}{15}\)

\(\Rightarrow\frac{304}{15}\)

a) 0,01 : 25 = ( 0,75 . x ) : 0,75

\(\Rightarrow\frac{1}{2500}=0,75\cdot x:0,75\)

\(\Rightarrow x=\frac{1}{2500}\)

b) \(\left(3,8\right):\left(2x\right)=\frac{1}{4}:\frac{8}{3}\)

\(\Rightarrow3,8:\left(2x\right)=\frac{3}{32}\)

\(\Rightarrow2x=3,8:\frac{3}{32}=\frac{608}{15}\)

\(\Rightarrow x=\frac{608}{15}:2=\frac{304}{15}\)

Giữ lời hứa nka Nguyễn Mạnh Tân!

làm nhanh mình k cho

Hứa k r lm cko! Bài dài lắm

( 0,25x ) : 3 = 5/6 : 0,125

( 1/4x ) : 3 = 5/6 : 1/8

( 1/4x ) : 3 = 5/6 x 8

( 1/4x ) : 3 = 20/3

1/4x          = 20/3 x 3

1/4x         = 20

x              = 20 : 1/4

x              = 80

0,01 : 2,5 = ( 0,75x ) : 0,75

1/100 : 25/10 = (3/4x) : 3/4

1/100 x 10/25 = (3/4x) : 3/4

=>(3/4x) : 3/4 = 1/250

3/4x                = 1/250 x 3/4

3/4x                = 3/1000

x                     = 3/1000 : 3/4

x                     = 1/250

 4/3 : 0,8 = 2/3 : ( 0,1x )

<=>2/3 : (0,1x) = 4/3 : 0,8

2/3 : (0,1x) = 4/3 : 4/5

2/3 : (0,1x) = 4/3 x 5/4

2/3 : (0,1x) = 5/3

2/3 : (1/10x) = 5/3

1/10x           = 2/3 : 5/3

1/10x           = 2/3 x 3/5

1/10x           = 2/5

x                  = 2/5 : 1/10

x                  = 2/5 x 10

x                  = 4