- hình thoi có cặp 4 cạnh bằng nhau là FG, EH, FE, GH

- có 2 cặp cạnh đối diện song song và bằng nhau là FG và EH, FE và GH

- 2 đường chéo và vuông góc là FH GE

Vì hình abcd là hình vuông nên BC = 4 cm, CD = 4 cm, AD = 4 cm

các góc đỉnh A, B, C, D = 90 độ vì hình vuông có 4 góc bằng nhau và đều là góc vuông

Mẹ Lan mua 2kg khoai tây hết số tiền là

24 500 * 2 = 49 000

Mẹ Lan mua 5kg gạo hết số tiền là

21000 * 5 = 105 000

Mẹ Lan còn lại số tiền là

160 000 - ( 105 000 + 49 000 ) = 6000 đồng

VI, XXIV, XXXIX

12, 18

my friend is duong. her name is duong. she has a long curly black hair. she is very friendly and helpful. she always helps me in a execise. i like she very much because she is so kind

Hi Mira,

Thanks for your mail. Now i'll tell you about my house.

I live a nice house.

My house is so beautiful.

My house has 4 rooms, a living room, a dinner room, a bedroom and a bathroom.

I live in Ha Noi city.

I live in a nice house.

There are 4 rooms in my house, living room, dinner room, bedroom and bathroom.

I like the best my bedroom because it so beautiful.

The name of my school is Phu La secondary school.

My school is very beautiful.

My favourite subject is Vietnamese because it is very interesting.

I study in 6A8 class.

The students are very funny and kind.

My teacher is Ha.

She is hark working and very funny.

1: The name of my school is Phu La secondary school.

2: My school is in Ha Noi city.

3: My school has 40 classes

4: The students study at my school.

5: My school is very beautiful and has many trees.