Question

25 phần 27 : 4 phần 7 + 2 phần 27 : 4 phần 7 

| x-1 | = 4 phần 5 

Chỉ mình đê các bạn .

 

 

Answer 1

\(\frac{25}{27}:\frac{4}{7}+\frac{2}{27}:\frac{4}{7}\)

\(=\frac{4}{7}\left(\frac{25}{27}+\frac{2}{27}\right)\)

\(=\frac{4}{7}.1\)

\(=\frac{4}{7}\)

| x - 1 | = \(\frac{4}{5}\)

\(\Rightarrow\orbr{\begin{cases}\left|x-1\right|=\frac{4}{5}\\\left|x-1\right|=\frac{-4}{5}\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{9}{5}\\x=\frac{1}{5}\end{cases}}}\)

Answer 2

\(\frac{25}{27}:\frac{4}{7}+\frac{2}{27}:\frac{4}{7}\)

= \(\left(\frac{25}{27}+\frac{2}{27}\right):\frac{4}{7}\)

=\(1:\frac{4}{7}=\frac{7}{4}\)\(=1\frac{3}{4}\)

Answer 3

\(a.\frac{25}{27}\div\frac{4}{7}+\frac{2}{27}\div\frac{4}{7}\)

\(=\frac{25}{27}\times\frac{7}{4}+\frac{2}{27}\times\frac{7}{4}\)

\(=\frac{7}{4}\times(\frac{25}{27}+\frac{2}{27})\)

\(=\frac{7}{4}\times1=\frac{7}{4}\)

\(b.|x-1|=\frac{4}{5}\)

\(\Rightarrow\hept{\begin{cases}x-1=\frac{4}{5}\\x-1=\frac{-4}{5}\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}x=\frac{4}{5}-1\\x=\frac{-4}{5}-1\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}x=\frac{-1}{5}\\x=\frac{-9}{5}\end{cases}}\)