Độ dài cạnh AD là: 10 + 15 = 25 (cm) Độ dài cạnh CD là: 1 000 : 25 = 40 (cm) Diện tích tam giác MDC là: 15 × 40 : 2 = 300 (cm2) Đáp số: 300 cm2.

a) Diện tích hình thang trên là: (9 + 11,5) × 6,2 : 2 = 63,55 (cm2) Đáp số: 63,55 cm2. b) Bán kính của hình tròn là: 31,4 : 3,14 : 2 = 5 (cm) Diện tích hình tròn là: 3,14 × 5 × 5 = 78,5 (cm2) Đáp số: 78,5 cm2.

a: 15,6+32,88=48,48 b: 158,08-97,15=60,93 c: 15,45x1,6=24,72 d: 75:60=1,25

a: 15,6+32,88=48,48 b: 158,08-97,15=60,93 c: 15,45x1,6=24,72 d: 75:60=1,25

Last summer vacation, I went to Ha Long Bay with my family. It was sunny but not very hot. My younger sister and I went swimming. Then, we went to some souvenir shops. We bought a lot of different gifts for our friends. Next, my family went to a food stall for lunch. We ate fish and crab. The food was delicious, but most things were not cheap. They were quite expensive. Finally, We took a lot of photos and went to home by bus. After trip, we felt very happy because we had a great time get together. Our trip was great, if my family next time I travel, I will invite you to go with my family.

1.This is Emma's book

2 Go straight ahead past the library and then turn right

3.the pictures behind the window

4.They planted the trees