a, 7\(\dfrac{3}{5}\) : \(x\) = 5\(\dfrac{4}{15}\) - 1\(\dfrac{1}{6}\)

     \(\dfrac{38}{5}\) : \(x\) = \(\dfrac{79}{15}\) - \(\dfrac{7}{6}\)

              \(x\) = \(\dfrac{41}{10}\)

             \(x\) = \(\dfrac{38}{5}\) : \(\dfrac{41}{10}\)

              \(x\) = \(\dfrac{76}{41}\)

b, \(x\) \(\times\) 2\(\dfrac{2}{3}\) = 3\(\dfrac{4}{8}\) + 6\(\dfrac{5}{12}\)

    \(x\) \(\times\) \(\dfrac{8}{3}\)  = \(\dfrac{7}{2}\) + \(\dfrac{77}{12}\)

     \(x\) \(\times\) \(\dfrac{8}{3}\) = \(\dfrac{119}{12}\)

     \(x\)          = \(\dfrac{119}{12}\)

     \(x\)          = \(\dfrac{119}{12}\): \(\dfrac{8}{3}\)

     \(x\)           = \(\dfrac{119}{32}\)

VII.

1. married

3. possible

4. mechanic

VIII.

1. If Susan had a watch, she wouldn't be often late for work.

2. Have you heard about For a Better Future, which supports women in their fight for employment equality?

3. All the food was spoil because someone switched the freezer off.

4. What about visiting Trang An, a natural wonder of our area?

đây là pt 2 ẩn, phương trình 2 ẩn phải có 2 phương trình thì mới làm được

::((

\(\dfrac{3}{5}\) x \(\dfrac{1}{7}\) x 1\(\dfrac{1}{2}\)

= \(\dfrac{3}{35}\) x \(\dfrac{3}{2}\)

= \(\dfrac{9}{70}\)

y.z+-1 là j

mk k hiểu

2xy + 7xyz - 2xz

= 2x ( y - z ) + 7xyz

= 2  \(x\) \(\frac{3}{7}\) \(x\) \(\frac{5}{2}\) + 3yz

=3yz

cậu xem lại ddef và thay vào nha

= \(\frac{15}{7}\) + 

\(\dfrac{3}{5}\times\dfrac{4}{7}\times1\dfrac{1}{2}\)

\(=\dfrac{3}{5}\times\dfrac{4}{7}\times\dfrac{3}{2}\)

\(=\dfrac{3\times4\times3}{5\times7\times2}\)

\(=\dfrac{3\times2\times3}{5\times7}\)

\(=\dfrac{18}{35}\)