Trong một quần thể người đang cân bằng di truyền, tỉ lệ gen gây bệnh bạch tạng trong quần thể chiếm 40%. Một người đàn ông bình thường thuộc quần thể trên lấy một người vợ bình thường thuộc quần thể khác, gia đình vợ chỉ có em trai bị bạch tạng, những người còn lại đều bình thường. Họ dự định sinh 2 con. Trong các dự đoán sau, có bao nhiêu dự đoán đúng ?

I. Xác suất đứa con đầu lòng sinh ra là con trai bình thường nhưng mang gen bệnh là 1/3.

II. Xác suất đứa con đầu lòng có kiểu gen đồng hợp là 1/2.

III. Xác suất cả 2 đứa con sinh ra đều có kiểu gen đồng hợp lặn là 5/14.

IV. Xác suất trong 2 đứa con sinh ra có 1 đứa bình thường và 1 đứa con bị bệnh là 1/7.

       ( x- 3 ) = y( x + 2)

=> ( x + 2 - 5) = y( x+ 2)

=> ( x + 2) - 5 = y( x + 2)

Đặt x + 2 =a

=> a- 5 = ay

=> a - ay = 5 hay a( 1 -y) = 5 

(+) th1 a = 5 và 1 -y = 1 

hay x +2 = 5 và y = 0

=> x = 3 và y = 0

(+) th2 a = 1 hoặc1- y = 5

=> x + 2 = 1 và y = -4 

=> x = -1 và y = -4

(+)th3 a = -1; 1-y = - 5

(+) th 4 a = -5 ; 1 -y = - 5 

(tìm típ hộ mình nha) 

qua de con nit lop 2 cung bit do ban

Độ dài của sợi dây bằng tổng độ dài của hai nửa đường tròn (bằng chu vi của hình tròn) cộng 2 lần khoảng cách giữa hai trục.

Chu vi của hình tròn với đường kính 0,35 là:

0,35 x 3,14 = 1,099 (m)

Độ dài sợi dây là: 1,099 + 3,1 x 2 = 7,299 (m)

Đáp số: 7,299m.

Ư(60)={1;2;3;4;5;6;10;12;15;20;30;60)

Ư(504)={1;2;3;4;6;7;8;9;56;63;72;84;126;168;252;504}

 60 chia hết cho a và 504 chia hết cho a

=>a thuộc ƯC(60;504)={1;2;3;4;6}

vậy a={1;2;3;4;6}

1. He is an intelligent boy.

-What an intelligent boy!
2. It is fresh milk.

-What fresh milk!
3. They are naughty students. (bn viết thiếu nha)

-What naughty students!
4. It is an exciting trip.

-What an exciting trip!
5. They are delicious cakes. (thiếu nữa)

-What delicious cakes!
6. He is a good child.

-What a good child!
7. It is a lovely view.

-What a lovely view!
8. They are bright rooms.

-What bright rooms!
9. The weather is very awful.

-What awful weather!
10. The meal is very delicious.

-What a delicious meal!
11. The boy is very clever.

-What a clever boy!
12. The pictures are very colorful.

-What colorful pictures!
13. The dress is very expensive.

-What an expensive dress!
1, This is a very comfortable room .

-> What a comfortable room!
How the room comfortable is!
2, These are modern computers

->What modern computers!
How computers modern are!
3, She is an intelligent girl.

->What an intelligent girl!
How the girl intelligent is!
4, That student is excellent

->What an excellent student!
How the student excellent is!
5, He’s very friendly.

->What a friendly boy/man!
How the boy/man friendly is!
6, This book is very interesting.

->What an interesting book!
How the book interesting is!
7, That bicycle is very old.

->What an old bicycle!
How the bicycle old is!
8, This cake is very delicious.

->What a delicious cake!
How the cake delicious is!
9, They are expensive dresses.

->What expensive dresses! 
How dresses expensive are!
10, It is a good dishwasher

->What a good dishwasher!
How the dishwasher good is!
11, The movie is very interesting

->What an interesting movie!
How the movie interesting is!
12, The bed is very comfortable.

->What a comfortable bed!
How the bed comfortable is!

 Chuyển các câu sau sang câu hỏi – nghi vấn.

1. She’ll come tomorrow. 

-Will she come tomorrow?

2. He will help her with her homework. 

-Will he help her with her homework?

3. They will bake some more cakes. 

-Will they bake some more cakes?

4. It will be very hot this summer.

-Will it be very hot this summer? 

5. David will call his teacher next week. 

-Will David call his teacher next week?

6. April will win this game later. 

-Will April win this game later?

7. He will believe us soon. 

-Will he believe you soon?

8. It will snow at Christmas. 

-Will it snow at Chrismas?

9. She will tell the truth. 

-Will she tell the truth?

10. I will change my job. 

-Will you change your job?

Viết các câu hoàn chỉnh sử dụng thì tương lai đơn và các từ cho sẵn.

0. She/ probably/ come/ back/ tomorrow.

-She will probably come back tomorrow.

1. You/ send/ this letter/ for me? 

-Will you send this letter for me?

2. What/ the weather/ be/ like next week? 

-What will the weather be like next week?

3. I/ send/ the contract/ to/ you/ tomorrow.

-I will send the contract to you tomorrow.

4. Gracie/ learn/ to/ play the violin. 

-Gracie will learn to play the violin.

5. How/ he/ get/ there?

-How will he get there?

6. Tom/ spend/ his summer holiday in Greece next year.

-Tom will spend his summer holiday in Greece next year.

7. I/ give/ you/ the money/ tomorrow.

-I will give you the money tomorrow.

8. I/ wait/ until/ she/ agree to marry me. 

-I will wait until she agree to marry me.

9. You/ give that to Tom/ when you/ see him, please? 

-Will you give that to Tom when you see him, please?

10. She/ never/ let/ you down. 

-She will never let you down.

1) homework/ to / students/ ought/ their/ carefully/ do. 

-Students ought to do their homework carefully.

2) She/ my class/ is/ enough/ old/ in/ not/ tobe

-She is not old enough tobe in my class.

3) how/ English/ to/ me/ tell/ study/ you/ Could. 

-Could you tell me how to study English?

4) My/ black/ hair/ has/ long/ curly/ friend. 

-My friend has long curly black hair.