Question

Tìm x

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

b/ 5 \(\frac{8}{17}\) : x + (- \(\frac{1}{17}\)): x + 3 \(\frac{1}{17}\): 17\(\frac{1}{3}\)= \(\frac{4}{17}\)

c/ \(\frac{1}{1.4}\)+\(\frac{1}{4.7}\)+\(\frac{7}{7.10}\)+ ...+ \(\frac{1}{x\left(x+3\right)}\)= \(\frac{6}{19}\)

Answer 1

a) (\(6\frac{2}{7}.x+\frac{3}{7}\))=-1.\(\frac{11}{5}+\frac{3}{7}\)

(\(6\frac{2}{7}.x+\frac{3}{7}\))=\(\frac{-62}{35}\)

\(\frac{44}{7}.x\)=\(\frac{-62}{35}-\frac{3}{7}\)

\(\frac{44}{7}.x=\frac{-77}{35}\)

x=\(\frac{-77}{35}:\frac{44}{7}\)=\(\frac{539}{1540}\)