thế giới đang quay ngược:')

sai sai

Đáp án : $P=\{\frac{1}{x}\mid x\in N;1\le x\le 5\}$

4 cm² là sao

_^:)

 { (Số cuối - số đầu) chia khoảng cách + 1 } x {Số đầu + số cuối) : 2

_^:))

a) M={10;11;12;13;14}
b) K={1;2;3}
c) L={0;1;2;3}

1. I don't want to eat anything because I'm not hungry.
2. How much beef do you want?
3. Thuy and her friends are skipping rope now.
4. Phong goes fishing three times a week.
5. There is a garden behind the school.