a)                                         Giải

         Diện tích hình thang là:

              (9 + 11,5) x 6,2 : 2 =690,68 (cm2)

                    Đáp số:690,68cm2.

b)                Giải

       Bán kính hình tròn là:

         31,4:2:3,14=5(cm)

      Diện tích hình tròn là :

         31,4x5x5=78,5(cm2)

                    Đáp số:78,5(cm2)

a) 15,6 + 32,88 = 48,48

b) 158,08 + 97,15 = 78,83

c) 15,45 x 1,6 = 24,720

d) 75 : 60 = 1,25

a) 15,6 + 32,88 = 48,48

b) 158,08 + 97,15 = 78,83

c) 15,45 x 1,6 = 24,720

d) 75 : 60 = 1,25

1. It's on the ground floor.

2. He likes solving Maths problems.

3. No, they didn't.

4. They danced around campfire.

5. It's Ben's.

1. I like surfing the Internet.

2. I like reading books.

3. I'd like to be a teacher.

4. No, I weren't.

5. I did projects.

I was at the funfair. It's rains. In the morning, I practiced the piano and did projects. In the afternoon, I rode my bike. I felt fun.

1. It's Emma.

2. Go past the library and turn right.

3. It's beside the window.

4. They plant trees.