a) x : 2,5 = 1/100

x = 1/250 * 2,5

x= 1/100

b) 5/3= x : 4/5

x= 4/5 * 5/3

x= 4/3

a) \(x\div2.5=0.003\div0.75\)

\(x\div2.5=0.004\)

\(x=0.004×2.5\)

\(x=0.01\)

Vậy, \(x=0.01\)

b) \(\frac{2}{3}\div0.4=x\div\frac{4}{5}\)

\(x\div\frac{4}{5}=\frac{5}{3}\)

\(x=\frac{5}{3}×\frac{4}{5}\)

\(x=\frac{20}{15}=\frac{4}{3}\)

Vậy, \(x=\frac{4}{3}\)

Cbht

a, Lời giải

\(x:2,5=\frac{1}{100}\)

\(x=\frac{1}{100}.2,5\)

\(x=\frac{1}{100}\)

b, Lời giải 

\(\frac{5}{3}=x:\frac{4}{5}\)

\(x=\frac{4}{5}.\frac{5}{3}\)

\(x=\frac{4}{3}\)

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

x:2,5=0,003:0,75

=>x:2,5= 0,004

=>x=0,004.2,5

=>x= 0,01

Vậy x=0,01

a, Ta có: x = 2,5 . 3/5 : 7,5 = 1/5

b, Ta có: x = 3 . 5 : 7 = 15/7

c, Ta có: x = -2 . 37 : 3,6 = -185/9

a) \(2.5\div7.5=x\div\frac{3}{5}\)

\(x\div\frac{3}{5}=\frac{1}{3}\)

\(x=\frac{1}{3}×\frac{3}{5}\)

\(x=\frac{3}{15}=\frac{1}{5}\)

Vậy, \(x=\frac{1}{5}\)

b) \(x\div5=3\div7\)

\(x\div5=\frac{3}{7}\)

\(x=\frac{3}{7}×5\)

\(x=\frac{15}{7}\)

Vậy, \(x=\frac{15}{7}\)

c) \(x\div37=\frac{-2}{3×6}\)

\(x\div37=\frac{-5}{9}\)

\(x=\frac{-5}{9}×37\)

\(x=\frac{-185}{9}\)

Vậy, \(x=\frac{-185}{9}\)

Cbht

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

a)

\(3\frac{4}{5}:40\frac{8}{15}=0,25:x\)

\(\Rightarrow\frac{19}{5}:\frac{608}{15}=\frac{1}{4}.x\)

\(\Rightarrow\frac{1}{4}.x=\frac{3}{32}\)

\(\Rightarrow x=\frac{3}{8}\)

Vậy x = 3 / 8

b) \(\frac{5}{6}:x=20:3\)

\(\Rightarrow\frac{5}{6x}=\frac{20}{3}\)

\(\Rightarrow120x=15\)

\(\Rightarrow x=\frac{1}{5}\)

Vậy x = 1 / 5

c)

\(x:2,5=0,003:0,75\)

\(\Rightarrow x.\frac{2}{5}=\frac{3}{1000}.\frac{4}{3}\)

\(\Rightarrow x.\frac{2}{5}=\frac{1}{250}\)

\(\Rightarrow x=\frac{1}{100}\)

d)

\(\frac{2}{3}:0,4=x:\frac{4}{5}\)

\(\Rightarrow\frac{2}{3}:\frac{2}{5}=\frac{5x}{4}\)

\(\Rightarrow\frac{5x}{4}=\frac{5}{3}\)

\(\Rightarrow15x=20\)

\(\Rightarrow x=\frac{4}{3}\)

Vậy x = 4 / 3

a) \(\left(\dfrac{1}{4}x\right):3=\dfrac{5}{6}:\dfrac{1}{8}\\ \left(\dfrac{1}{4}x\right):3=\dfrac{20}{3}\\ \dfrac{1}{4}x=\dfrac{20.3}{3}\\ \dfrac{1}{4}x=20\\ x=80\)

a: Ta có: \(\dfrac{0.25x}{3}=\dfrac{5.6}{0.125}\)

\(\Leftrightarrow x\cdot\dfrac{1}{4}=134.4\)

hay x=537,6

b: Ta có: \(\dfrac{2.5}{7.5}=x:\dfrac{3}{5}\)

\(\Leftrightarrow x:\dfrac{3}{5}=\dfrac{1}{3}\)

hay \(x=\dfrac{1}{5}\)

\(\dfrac{5}{2}:\dfrac{15}{2}=x:\dfrac{7}{5}\\ x:\dfrac{7}{5}=\dfrac{1}{3}\\ x=\dfrac{7}{15}\)

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