Question

Tìm x biết (x. \(6\frac{2}{7}\) + 3/7 ). \(2\frac{1}{5}\) - 3/7 = -2

Answer 1

\(\left(x.\frac{44}{7}+\frac{3}{7}\right).\frac{11}{5}=-2+\frac{3}{7}\)

\(\Rightarrow\left(x.\frac{44}{7}+\frac{3}{7}\right).\frac{11}{5}=\frac{-11}{7}\)

\(\Rightarrow x.\frac{44}{7}+\frac{3}{7}=\frac{-11}{7}:\frac{11}{5}=-\frac{5}{7}\)

\(\Rightarrow x.\frac{44}{7}=-\frac{5}{7}-\frac{3}{7}=-\frac{8}{7}\)

\(\Rightarrow x=-\frac{8}{7}:\frac{44}{7}=-\frac{8}{7}.\frac{7}{44}=-\frac{8}{44}=-\frac{2}{11}\)

vậy x = -2/11