1. He didn't watch TV last night.

 Did he watch TV last night ?

2.Lan didn't go to Lao Cai yesterday.

 Did Lan go to Lao Cai yesterday ?

3.Ha isn't a teacher.

 Does Ha is a teacher ?

4.She didn't play guitar last week.

Did she play guitar last week ?

5.They weren't late to school

Were they late to school ?

6.I didn't see her two days ago.

Did you see her two days ago ?

7.Mai doesn't brush her teeth every day.

Does Mai brush her teeth every day ?

8.There isn't a flower on the park.

Is there a flower on the park ?

9.I don't walk to school every morning.

Do you walk to school every morning ?

10.They don't live in the small village.

Do they live in the small village ?

11. I am not a student.

Are you a student ?

12.They aren't doctors.

Are they doctors ?

13.His mother isn't cooking the meat now.

 Is his mother cooking the meat now ?

14.We aren't playing at the moment.

Are they playing at the moment ?

15.Minh doesn't play the piano every day.

Does Minh play the piano every day ?

Đây bn nhé

5/9;11/18;11/15;14/15

Hoa có số bông hoa là:

     36 x 4 =144 ( bông )

            Đáp số : 144 bông hoa

My teacher is teaching us English at the moment.

My teacher is teaching us English at the moment.

22

22

X x 1,5=8,6 x 15 + 4,5.

X x 1,5 =    129 + 4,5

X x 1,5 =          133,5

        X =          133,5 : 1,5

         X =         89

   Vậy X=89

1,                       Giải
      Ta có sơ đồ:
      Gà mái:   _ _ _ _ _       
      Gà trống: _ _ _40 con 
      Số gà mái mẹ nuôi là:

          40:2x5=100 (con gà)

      Số gà trống mẹ nuôi là:

          100-40=60 (con gà)

                    Đáp số: Gà mái    100 con

                                  Gà trống  60 con

2,

    a,7/3 x 2/7-1/6

      =2/3-1/6

      =1/2

b,17/5 : 3/4 - 1/4

   =68/15 - 1/4

   =257/60

46-8<50-1<60-20