1. brushes

2. Do-have

3. go 

4. is

5. Do-you         is blowing

6. What does your son usually have for breakfast?

7. has

8. is standing    is waiting

9. is coming    is

a,

\(x.\dfrac{1}{4}=\dfrac{1}{2}-\dfrac{4}{5}\)

\(x.\dfrac{1}{4}=\dfrac{5}{10}-\dfrac{8}{10}\)

\(x.\dfrac{1}{4}=-\dfrac{3}{10}\)

\(\Rightarrow x=-\dfrac{3}{10}:\dfrac{1}{4}\)

\(\Rightarrow x=-\dfrac{3}{10}.4\)

\(\Rightarrow x=-\dfrac{6}{5}\)

b,

\(\dfrac{2}{3}-x=\dfrac{1}{2}:\dfrac{3}{8}\)

\(\dfrac{2}{3}-x=\dfrac{1}{2}.\dfrac{8}{3}\)

\(\dfrac{2}{3}-x=\dfrac{4}{3}\)

\(x=\dfrac{2}{3}-\dfrac{4}{3}\)

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

a,

\(x:2=\dfrac{2}{3}+\dfrac{3}{4}\)

\(x:2=\dfrac{8}{12}+\dfrac{9}{12}\)

\(x:2=\dfrac{17}{12}\)

\(\Rightarrow x=\dfrac{17}{12}\) x \(2\)

\(\Rightarrow x=\dfrac{17}{6}\)

b, 

\(x\) x \(\dfrac{1}{5}=1-\dfrac{3}{25}\)

\(x\) x \(\dfrac{1}{5}=\dfrac{25}{25}-\dfrac{3}{25}\)

\(x\) x \(\dfrac{1}{5}=\dfrac{22}{25}\)

\(\Rightarrow x=\dfrac{22}{25}:\dfrac{1}{5}\)

\(\Rightarrow x=\dfrac{22}{25}\) x \(5\)

\(\Rightarrow x=\dfrac{22}{5}\)

lỗi

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