There was a girl and a boy talking about studying.
a woman is filling up her car with gas
a group of students are dancing on stage
A group of workers are installing solar panels.

1. My full name's Pham Thi Thuy Duong.

2. My favorite subject is math and music.

3. I usually use public transportation.

4. I like 50th anniversary of national reunification festival the most.

5. I often use English outside school.

lan cham chi lam

viec nha de lam gi ?

A(x)

ko bít

a) \(\dfrac{-2}{7}\)+ \(\dfrac{2}{7}\): \(\dfrac{3}{5}\)

= \(\dfrac{-2}{7}\)+ \(\dfrac{2}{7}\) . \(\dfrac{5}{3}\)

= \(\dfrac{-2}{7}\)+ \(\dfrac{10}{21}\)

= \(\dfrac{-6}{21}\)+ \(\dfrac{10}{21}\)

=\(\dfrac{\left(-6\right)+10}{21}\)

=\(\dfrac{4}{21}\)

b) \(\dfrac{-8}{19}\)+ \(\dfrac{-4}{21}\)- \(\dfrac{17}{21}\)+ \(\dfrac{27}{19}\)

= \(\dfrac{-8}{19}\)+ \(\dfrac{-4}{21}\)+ \(\dfrac{17}{21}\)+ \(\dfrac{27}{19}\)

=(\(\dfrac{-8}{19}\)+ \(\dfrac{27}{19}\)) + ( \(\dfrac{-4}{21}\)+\(\dfrac{-17}{21}\))

=