Question

Tìm x biết : 

              a) \(x.\frac{13}{20}+x:2=\frac{4}{7}\)

              b) \(x:1+x:\frac{1}{2}+x:\frac{125}{1000}=60\)

              

 

Answer 1

a) \(x\cdot\frac{13}{20}+x:2=\frac{4}{7}\)

\(x\cdot\frac{13}{20}+x\cdot\frac{1}{2}=\frac{4}{7}\)

\(x\cdot\left(\frac{13}{20}+\frac{1}{2}\right)=\frac{4}{7}\)

\(x\cdot\frac{23}{20}=\frac{4}{7}\)

\(x=\frac{4}{7}:\frac{23}{20}\)

 b) \(x:1+x:\frac{1}{2}+x:\frac{125}{1000}=6\)

\(x\cdot\frac{1}{2}+x\cdot2+x\cdot8=6\)

\(x\cdot\left(\frac{1}{2}+2+8\right)=6\)

\(x\cdot\frac{21}{2}=6\)

\(x=6:\frac{21}{2}\)

\(x=\frac{6}{7}\)