còn đang lo học này tiền j

0dd

\(\vee\) \(ì\) \(1+1=2\)

A,C

\(81\)

chịu

nhiều quá

14) \(5 - \frac{1}{2} \left(\right. x - 3 \left.\right) = 6 - \frac{1}{5} + \frac{1}{2}\)

\(5 - \frac{1}{2} x + \frac{3}{2} = \frac{63}{10}\)

\(\frac{13}{2} - \frac{1}{2} x = \frac{63}{10}\) \(- \frac{1}{2} x = - \frac{1}{5} \Rightarrow x = \frac{2}{5}\)

mấy cái trùng nhau là xuống dòng á:

13) \(\frac{3}{2} \left(\right. x - \frac{4}{9} \left.\right) = \frac{4}{7} \left(\right. 7 - \frac{1}{4} \left.\right) - \frac{1}{3}\)

\(7 - \frac{1}{4} = \frac{27}{4} \Rightarrow \frac{4}{7} \cdot \frac{27}{4} = \frac{27}{7}\) \(\frac{27}{7} - \frac{1}{3} = \frac{74}{21}\) \(\frac{3}{2} x - \frac{2}{3} = \frac{74}{21}\) \(\frac{3}{2} x = \frac{88}{21} \Rightarrow x = \frac{176}{63}\)

\(x = \frac{176}{63}\)