Today, I fell comfortable

\(\dfrac{5.7}{2.7}\)+\(\dfrac{4.7}{7.11}\)+\(\dfrac{3.7}{11.14}\)+\(\dfrac{1.7}{14.15}\)+\(\dfrac{13.7}{15.28}\)

7(\(\dfrac{5}{2.7}\)+\(\dfrac{4}{7.11}\)+\(\dfrac{3}{11.14}\)+\(\dfrac{1}{14.15}\)+\(\dfrac{13}{15.28}\))

=7. (\(\dfrac{1}{2}\)-\(\dfrac{1}{7}\)+\(\dfrac{1}{7}\)-\(\dfrac{1}{11}\)+\(\dfrac{1}{11}\)-\(\dfrac{1}{14}\)+\(\dfrac{1}{14}\)-\(\dfrac{1}{15}\)+\(\dfrac{1}{15}\)-\(\dfrac{1}{28}\))

=7.(\(\dfrac{1}{2}\)-\(\dfrac{1}{28}\))

=7.\(\dfrac{14-1}{28}\)=7.\(\dfrac{13}{28}\)=\(\dfrac{13}{4}\)

câu 1

1.b 2.c 3.d 4.b

câu 2

1.are

2.lives

3.play

4.is watching

5.do.....go

6.is....... doing

a, my family has five people

b, why don't we listen to music

c, would you like to go fishing

d,this book of mine

e, my school is behind a store

1.the=>a

2.neighbor=>neighborhood

3.where do your friends live

4.to=> bỏ to

5. cho are vào sau chidren

6.cho are vào sau there