I

1 play

2 get

3 are learning

4 are going to

II

1 book => books

2 on => in

3 have => to have

4 going => go

III

1 - B

2 - C

3 - D

4 - A

IV

1 What a beautiful girl!

2 How far is it from Viet Tri to Ha Noi?

4 We often skip rope at recess

5 How much does this book cost?

V

1 Yes, they do

2 They play football, badminton and table tennis

3 Yes, they do

4 They feel happy

Cảm ơn bạn rất nhiều! ❤️

3.1:

Ô tô đi hết 1h50'+40'=2h30'

3.2:

Ô tô đi hết:

17h50'-15h15'

=2h35'

Tin học à

Lớp mấy vậy 

hhơn qué đi lấy cún tập vẫn kụp:P

Gọi số ly trà sữa là x

=>Số ly trà đào là 210-x

Theo đề, ta có: 27000x=2*18000(210-x)

=>27000x-36000(210-x)=0

=>27000x-7560000+36000x=0

=>x=120

=>Số ly trà đào là 90 ly

doesn't she
isn't it
has he
wasn't he
aren't they
is it
must he
isn't she
don't they
hasn't he
do they
didn't he
did she
isn't it
didn't he
was it
does she
doesn't he
didn't he
do they
didn't they
aren't there

a: Xét ΔADC vuông tại D có DH là đường cao

nên \(AD^2=AH\cdot AC\)

=>\(AC=\frac{6^2}{3,6}=10\left(\operatorname{cm}\right)\)

ΔADC vuông tại D

=>\(AD^2+DC^2=AC^2\)

=>\(DC^2=10^2-6^2=100-36=64=8^2\)

=>DC=8(cm)

ABCD là hình chữ nhật

=>AB=CD

=>AB=8(cm)