\(\dfrac{2}{7}+x=\dfrac{5}{7}\)

       \(x=\dfrac{5}{7}-\dfrac{2}{7}\)

       \(x=\dfrac{3}{7}\)

Số học sinh nam của lớp 5A là:

  27 x \(\dfrac{5}{9}\) = 15 ( học sinh) 

=> C. 15

\(15000.10=150000\)\(\) nha

Choose the correct answer

1. What time does Nga ________ every morning?

A. gets up       B. get up    C. get    D. gets

2. He _________ breakfast at six o'clock every mornings.

A. have          B. having    C. has     D. to have

3. Our classroom is _______ the second floor

A. from     B. in    C. at    D. on

4. What time ______ every morning?

A. do Mai gets up          B. does Mai gets up

C. does Mai get up        B. does get Mai up

5. We play games _______ the afternoon 

A. on       B. in          C. at        D. to

6. _______ your parents do? - They are workers

A. How does   B. What does   C. What do  D. Who

7. How many floors _________ your school have?

A. do     B. does   C. is   D. are

8. What do your students often ______ after school?

A. do    B. does   C. did   D. to do

9. Students have two _______each day

A. 20- minute break       B. 20-minutes break

C. 20-minute breaks      D. 20-minutes breaks

10. Would you like ______ to music?

A. listening   B. to listen  C. listen  D. listens

\(4\dfrac{1}{6}:2\dfrac{1}{3}=\dfrac{25}{6}:\dfrac{7}{3}=\dfrac{25}{6}.\dfrac{3}{7}=\dfrac{75}{42}=>B.\dfrac{75}{42}\)

\(C.competition\)

phần a sai rồi nhé

a) \(6dm2cm=6dm+\dfrac{2}{10}dm=2\dfrac{2}{10}dm\)

b) \(7m9cm=7m\dfrac{9}{100}m=7\dfrac{9}{100}m\)

c) \(9kg7g=9kg+\dfrac{7}{1000}kg=9\dfrac{7}{1000}kg\)

d) \(4kg15g=4kg+\dfrac{15}{1000}kg=4\dfrac{15}{1000}kg\)