9 x 9 = 81

8 x 8 = 72

Bài này là bài lớp 8 đó bạn :

 \(\left(2+ab\right)^2=2^2+2.2ab+\left(ab\right)^2\)

\(=4+4ab+a^2b^2\)

Chu vi hình chữ nhật là:

(12+3)x2=30(cm)

Đáp số:30cm

IV: Complete the following passage with an appropriate form of the given word .

0. Some of my ………relatives…….. live in the countryside. relate

1. Students should be...........encouraged...............to be proud of school uniforms. courage

2. In the future, many buildings will be......heated.......by solar energy. hot

3. We want to buy...........product.............that will save money. produce

4. They live in a ................mountainous............area in the north-east of the country. mountain

5. His sudden ...............death.........must be a sock to his family. die

6. We are very impressed by the .......friendliness...........of your town’s people. friend

7. Livepool is an..........industrial............. city in the north of England. industry

8. He is a ...........curious..........boy. He is always asking questions. curiosity

9. My father can help you to make a good...............choice............... choose

10. He has ........recently..............bought a new car and a modern house. recent

a,0²=0 ; 1²=1 ; 2²=4 ; 3²=9 ; 4²=16 ; 5²=25 ; 6²=36 ; 7²=49 ; 8²=64 ; 9²=81 ;

   10²=100 ; 11²=121 ; 12²=144 ; 13²=169 ; 14²=196 ; 15²=225 ; 16²=256 ; 17²=289 ; 18²=324 ; 

   19²=361 ; 20²=40

b, 64=8²

   169=13²

   196=14²

kb vs mk nha các bạn

xem lại đề, chỗ 3xy²

Ngày 1/7 là bắt đầu ạ ??

Thắng Nguyễn đúng rồi ha