a,3x.(x-1)+x-1=0

=> (x - 1) (3x + 1) = 0

=> x - 1 = 0 hoặc 3x + 1 = 0

=> x = 1 hoặc x = \(\frac{-1}{3}\)

b,2.(x+3)-x2-3x=0

=> 2. (x + 3) - x (x-3) = 0

=> (x - 3) (2 - x) = 0

=> x - 3 = 0 hoặc 2 - x = 0

=> x = 3 hoặc x = 2

P/s: Mỗi chữ hoặc bạn thay = dấu [ nhé (Thay dấu này chắc bạn biết cách trình bày rồi nha)

- Nhớ tick [Nếu đúng] nha 

1. Nylon was invented in the year 1937.

2. Hình như thiếu đề bạn à 

3. Mom asked me when my school vacation started.

4. If I were you, I wouldn't buy that bicycle.

5. They prefer classical music to pop music.

- Ở trước máy tính 

\(\frac{9}{X}=\frac{y}{5}\)

\(\Rightarrow\)XY=5.9

\(\Rightarrow\)XY=45

\(\Rightarrow\)X,Y\(\in\)Ư(45) 

- Nhiều người thấp nhỉ 

1.Lan(go )......................to school every day with her friends.

=> goes

2.They ( have ).....................a party tonight.

=> will have/ are going to have [Theo mình thì đáp án thứ 2 phù hợp hơn]

3.The students ( visit ).........................their old teachers next week ?

=> Will the students visit....?

4.She ( not have ).................bread for her breakfast.

=> didn't have

5.I need( call).........................my parents today and ( tell)..............them about my new apartment.

=> to call _ tell

6.They can't call me because they ( not know )............my new telephone number.

=> don't know

7.It ( rain )............As soon as the rain ( stop)...........I will walk downtown.

=> is going to rain _ stops

8. What your sister (do).................now?

=> ..... is your sister doing....?

9.She ( cook )..................dinner in the kitchen.

=> is cooking

10. We ( not go )..............camping next week.We (visit)................the museum.

=> aren't going _ are going to visit

- Good night, have a nice dream 

- K được nhé

25502500 

Sai là cái chắc, nhưng nếu đúng thj` tik cho cái .

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