47,86 – 3,45=44,41

12,520 +  22,34  =34,86

NO

to go

 \(x+\dfrac{-7}{13}=\dfrac{-21}{13}\)

TÌM X BIẾT a) \(\dfrac{5}{9}-x=\dfrac{-3}{9}\)

B=\(\dfrac{11}{17}+\left(-\dfrac{8}{19}\right)+\left(-\dfrac{3}{4}\right)+\dfrac{6}{17}-\dfrac{30}{19}\)

A=-\(\dfrac{5}{7}\)+\(\dfrac{8}{11}+\)\(\left(-\dfrac{2}{7}\right)\)+ \(\dfrac{1}{2}\)\(+\dfrac{3}{11}\)

6. As it doesn’t snow in Viet Nam, we can not ……….. skiing.

A. play B. go C. do

7. Many girls and women …… aerobics to keep fit.

A. play B. go C. do

8. It’s very …………… to swim there. The water is healthy polluted

A. safe B. unsafe C. unpopular

9. ……………do you to the gym? - By bus.

A. What B. How C. Why

10. What is your favorite …………? I like swimming.

A. subject B. game C. sport chúc em học tốt