A= (2011+2019)+(2012+2018)+(2013+2017)+(2014+2016)+2015

A=4030+4030+4030+4030+2015

A=(4030+4030)+(4030+2015)+4030

A=8060+6045+4030

A=18135

Chu vi hình chữ nhật là:  2(10+6)=32 (m)

Cạnh hình vuông là: 32:4= 8(m)

Diện tích căn phòng  hình vuông là: 8.8=64 (m2)

-20213  > -20123

Question 1:

There is a science lab for experiments in the school.

Question 2:

Does the library has new computers

Question 3: 

An's camera is on the desk.

Question 4:

Tony doesn't eat pizza or chocolate for breakfast.

My favorite book is " detective Conan".He looks like a detective, he's smart and sharp. He likes reading mystery novels. I like him because he is smart, talented and sharp.