a) \(x+x\times\dfrac{1}{4}:\dfrac{2}{7}+x\times\dfrac{2}{9}=255\)
\(x+x\times\dfrac{7}{8}+x\times\dfrac{2}{9}=255\)
\(x\times\left(1+\dfrac{7}{8}+\dfrac{2}{9}\right)=255\)
\(x\times\dfrac{151}{72}=255\)
\(x=255:\dfrac{151}{72}\)
\(x=\dfrac{18360}{151}\)
Em viết lại đề cho chuẩn hơn đi chỗ x2/9
b) \(\dfrac{2}{3}+\dfrac{1}{3}\times x+\dfrac{11}{3}\times x=2014\)
\(\dfrac{1}{3}\times x+\dfrac{11}{3}\times x=2014-\dfrac{2}{3}\)
\(x\times\left(\dfrac{1}{3}+\dfrac{11}{3}\right)=\dfrac{6040}{3}\)
\(x\times4=\dfrac{6040}{3}\)
\(x=\dfrac{6040}{3}:4\)
\(x=\dfrac{1510}{3}\)