Question

tìm x:

a. (7/5 - 2x) .40/20 = 8/14

b. 7/2 . x - 20% . x = - 4

Answer 1

a,\(\left(\frac{7}{5}-2x\right).\frac{40}{20}=\frac{8}{14}\)

\(\Rightarrow\left(\frac{7}{5}-2x\right).2=\frac{4}{7}\)

\(\Rightarrow\frac{7}{5}-2x=\frac{4}{7}:2\)

\(\Rightarrow\frac{7}{5}-2x=\frac{2}{7}\)

\(\Rightarrow2x=\frac{7}{5}-\frac{2}{7}\)

\(\Rightarrow2x=\frac{39}{35}\)

\(\Rightarrow x=\frac{39}{35}:2\)

\(\Rightarrow x=\frac{39}{70}\)

Answer 2

b, \(\frac{7}{2}.x-20\%.x=-4\)

\(\Rightarrow x\left(\frac{7}{2}-20\%\right)=-4\)

\(\Rightarrow x\left(\frac{7}{2}-\frac{1}{5}\right)=-4\)

\(\Rightarrow x\frac{7}{10}=-4\)

\(\Rightarrow x=-4:\frac{7}{10}\)

\(\Rightarrow x=-\frac{40}{7}\)