Gọi y^2 - x(x+1)(x+2)(x+3)=-1 là phương trình (1)

Phương trình (1) tương đương với:

y^2-(x^2 +3x)(x^2+3x+2)=-1 (2)

đặt x^2 +3x =t

Ta có (2)<=> y^2 -t(t+2)=-1

<=>y^2 -t^2-2t=-1

<=>t^2+2t+1-y^2=2

<=>(t+1)^2-y^2=2

<=>(t+1+y)(t+1-y)=2

Từ đó lập các trường hợp rồi giải hệ phương trình nếu bn hk hỉu chỗ nào thì ib cko mik mik sẽ giãi thik thêm cho hi!!!

In my opinion, everyone have the same right to study at university or college. However, only the good student should study at higher education. Therefore, I agree with the second thought.

First, Studying at university or college is not easy for everyone. The students who were really excellent at high school should enter the university to study at the major that they are really good at. Although, the other students who are not good enough, can effort to study at university or college, It is still really hard for them, especially if they do not know exactly what they are studying.

Second, Studying at university or college sometimes wastes your time and money. It is not cheap to studying in university or college. Some families have to pay a lot of money for their children to study there. And the students themselves spend a lot of time at university doing the things they aren't good at.

Third, I believe university or college is the place for students who really desire to study the field they really care about. The others, who are not good at studying will have their own job out there in the society. They can learn from their experiences in work, learn from their failures or anywhere else. The important thing is that they are still excellent in their field and become the useful people for their country, may be the famous people in the world.

Albert Einstein said that: "Everyone is a genius, but if you judge a fish by its ability to climb a tree, it will live it whole life believe it is stupid". I believe so. Everyone of us have the same right to study, but we also have our own mission. So study in university or not is not the matter. The matter is we know ourselves, we know what we good at and what we are doing to make our own life and this world better.

Chúc bn hc tốt

You ought to wash the vegetables more carefully.Chúc bn hc tốt

Những Gì chúng ta có thể làm để tái chế rác?

1. Are there any wardrobes in your bedroom?

2.Are there any maps or pictures in your living room?

3.There are many things in the room.

4.How many doors are there?

Good luck to you!

1-complaint

2-advertisement

3-politeness

4-customary

5-experienced

(1) in taking(invoild in:bao gồm);(2) organizing (vì trc nó là giới từ);(3) to learn (vì người là vật thể sống nên need + to V);(4) thinking (theo nghĩa thì nó có nghĩa dừng làm việc j đó);(5) setting(vì câu có nghĩa là thử cái j đó);(6) to do(theo nghĩ là đừng cố gắng.....);(7)to finish;(8) starting (sau avoild là Ving);(9)to make(nghĩa của câu là dừng làm... và bắt đầu cái j đó.....).Chúc bn học tốt