a) \(x\) : 3 = 15 : 5 + 6

\(x\) : 3 = 3 + 6

\(x\): 3 = 9

\(x\)= 9 x 3

\(x\)= 27

b) \(x\) x 5 + 963 = 270 + 728

 \(x\) x 5 + 963 = 998

 \(x\) x 5 = 998 - 963

 \(x\) x 5 = 35

 \(x\) = 35 : 5

 \(x\) = 7

Bài 2

Giải: Ba hộp như vậy có tất cả số bút là: (3600 : 9) x 3 = 1200 (cái)

Đáp số: 1200 cái bút

1. Cá chép

2. Con chuột

3. Vịt

4. Mèo

5. Đà điểu

6. Sao la

Từ ô dọc: animal

= 1000.36

= 36000

Cua nhện

Những cánh diều ấy bay cao trên trời

II

3. Study

4. Country

B

2. bicycle

1. Serve the pancake with some vegetables

2. Have you ever been to an art gallery

3. There isn't any milk left

4. Water puppetry is performed in a pool

5. Life in Viet Nam is different from life in England

6. If people recycle more , there will be less pollution 

7. Minh has collected stamps since he was a child

8. Tom and Mary want two glasses of water

9. He doesn't want any eggs but he wants some cheese

a)

= [316 - (100 + 16)] : 8 - 24

= [316 - 116] : 8 - 24

= 200 : 8 - 24

= 25 - 24

= 1

b)

= 4.25 - 81 : 9 + 25.3 - 18 : 9

= 100 - 9 + 75 -2

= 91 + 75 - 2

= 166 - 2

= 164

c)

= 5\(^2\) + 4.27 - 1

= 25 + 108 - 1

= 133 - 1

= 132

d)

= 2\(^3\) + (-15) + 1

= 8 + (-15) + 1

= -7 + 1

= -6