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

\(\Leftrightarrow3,8:2x=\frac{3}{32}\)

\(\Leftrightarrow2x=3,8:\frac{3}{32}\)

\(\Leftrightarrow2x=\frac{608}{15}\)

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

\(b,0,25x:3=\frac{5}{6}:0,125\)

\(\Leftrightarrow0,25x:3=\frac{20}{3}\)

\(\Leftrightarrow0,25x=20\)

\(\Leftrightarrow x=80\)

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

\(\Leftrightarrow0,75x:0,75=\frac{1}{250}\)

\(\Leftrightarrow x=\frac{1}{250}\)

Mik lm hơi tắt chỗ nào chw hiểu thì hỏi mik nhé

c) \(x:\left(-2,14\right)=\left(-3,12\right):1,2\)

=> \(x:\left(-2,14\right)=-2,6\)

=> \(x=\left(-2,6\right).\left(-2,14\right)\)

=> \(x=5,564\)

Vậy \(x=5,564.\)

d) \(2\frac{2}{3}:x=2\frac{1}{2}:\left(-0,06\right)\)

=> \(\frac{8}{3}:x=\frac{25}{12}:\left(-\frac{3}{50}\right)\)

=> \(\frac{8}{3}:x=-\frac{625}{18}\)

=> \(x=\frac{8}{3}:\left(-\frac{625}{18}\right)\)

=> \(x=-\frac{48}{625}\)

Vậy \(x=-\frac{48}{625}.\)

Chúc bạn học tốt!

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

⇔ (0,75x).2,5 = 0,01.0,75

⇔ (0,75x) = (0,01.0,75) : 2,5

⇔ 0,75x = 0,003

⇔ x = 0,003 : 0,75 ⇔ x = 0,004

c) (0.01):2,5=(0,75x).(0,75)

         0,004 =(0,75x).(0,75)

         => x=0.0071

Đề này bn xem lại coi có đúng k

a)\(\frac{x}{64}=-\frac{16}{x}\Rightarrow x^2=-16\cdot64\)

\(\Rightarrow x^2=-1024\)

Do \(x^2\ge0>-1024=VP\)

=>x vô nghiệm

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

=>0,004=0,75:0,75*x

=>0,004=x

Vậy x=0,004