Question

       Tìm x trong các tỉ lệ thức :

a) \(x:2,5=0,003:0,75\)

b) \(\frac{2}{3}:0,4=x:\frac{4}{5}\)

Answer 1

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

Answer 2

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

Answer 3

a, Lời giải

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

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

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

b, Lời giải 

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

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

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