Bài 2d,e ( -80 nha Phân tích thành nhân tử 🍃🍃🍃🍃💨💨💨💨💨💨💨💨💨

hailynguyen068

2 năm trước

Loga Sinh Học lớp 12

0 lượt thích 13 xem

1 trả lời

Thích Trả lời

Tranthikimhoan30112000

`d)`

`x^7+x^5+1`

`=(x^7+x^6+x^5)-(x^6-1)`

`=x^5(x^2+x+1)-(x^3-1)(x^3+1)`

`=x^5(x^2+x+1)-(x-1)(x^2+x+1)(x^3+1)`

`=(x^2+x+1)[x^5-(x-1)(x^3+1)]`

`=(x^2+x+1)(x^5-x^4-x+x^3+1)`

`e)`

`(x-1)(x-2)(x-3)(x-4)-80`

`=[(x-1)(x-4)][(x-2)(x-3)]-80`

`=(x^2-x-4x+4)(x^2-3x-2x+6)-80`

`=(x^2-5x+4)(x^2-5x+6)-80`

Đặt `t=x^2-5x+4`

`=t(t+2)-80`

`=t^2+2t-80`

`=t^2+10t-8t-80`

`=t(t+10)-8(t+10)`

`=(t-8)(t+10)`

`=(x^2-5x+4-8)(x^2-5x+4+10)`

`=(x^2-5x-4)(x^2-5x+14)`

Vote (0) Phản hồi (0) 2 năm trước

vuongdongvhks1

Giải thích các bước giải :

`d)x^7+x^5+1`
`=(x^7-x)+(x^5-x^2)+(x^2+x+1)`
`=x(x^6-1)+x^2(x^3-1)+(x^2+x+1)`
`=x[(x^3)^2-1^2]+x^2(x^3-1)+(x^2+x+1)`
`=x(x^3-1)(x^3+1)+x^2(x^3-1)+(x^2+x+1)`
`=x(x^3+1)(x-1)(x^2+x+1)+x^2(x-1)(x^2+x+1)+(x^2+x+1)`
`=(x^2+x+1)[x(x^3+1)(x-1)+x^2(x-1)+1]`
`=(x^2+x+1)[x^5-x^4+x^2-x+x^3-x^2+1]`
`=(x^2+x+1)[x^5-x^4+x^3-x+1]`
`e(x-1)(x-2)(x-3)(x-4)-80`
`=[(x-1)(x-4)][(x-3)(x-2)]-80`
`=(x^2-5x+4)(x^2-5x+6)-80`
Đặt `x^2-5x+4=a,` thay lại ta được :
`a(a+2)-80`
`=a^2+2a-80`
`=(a^2+10a)-(8a-80)`
`=a(a+10)-8(a+10)`
`=(a+10)(a-8)`
`=(x^2-5x+4+10)(x^2-5x+4-8)`
`=(x^2-5x+14)(x^2-5x-4)`

Vote (0) Phản hồi (0) 2 năm trước

Các câu hỏi liên quan

Người và viết thạo nhiều thứ tiếng ngoại quốc : Pháp , Anh , Hoa , Nga ... và Người đã làm nhiều nghề . Nếu phân loại phân theo cấu trúc ngữ pháp thì câu trên thuộc loại câu nào ? Vì sao ?

giúp e với mng ơi,e cần gấp , e camon ạ!

Giải hộ mình với ạ 😘😘😘😘😘😘 mình còn có 10đ thôi mn thông cảm ạ 😘😘😘

viết đoạn diễn dịch khoảng 12 câu phân tích của người dân với biển cả qua khổ 5 bài 'đoàn thuyền đánh cá' trong doạn có 1 câu cảm thán,1 thành phần tình thái 'có lẽ'

giúp mình vs mn ơi ko cần gt cx đc

Giúp em với em cần gấp ạ 1.Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions. The COVID-19 has resulted in schools shut all across the world. People are more concerned about online learning platforms only then. A. Not until people are more concerned about online learning platforms has the COVID-19 resulted in schools shut all across the world. B. Hardly had the Covid-19 result in schools shut all across the world when people are more concerned about online learning platforms. C. Only after the COVID-19 has resulted in schools shut all across the world are people more concerned about online learning platforms. D. Without people’s concern about online learning platforms, schools all across the world wouldn’t have been shut down. 2.Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Most of Vietnamese peopleare satisfied ___ their government’s response to combat Covid-19 pandemic. A. above B. with C. to D. of

mog mn giúp mik vs ạ. Lát nx mik nộp ròi

Read the following passage and choose the letter A, B, C or D to indicate the correct answer to each of the questions. In many modern countries, people think of a family as a mother, a father and their children. But this is not the only kind of the family group. In some parts of the world, a family group has many other members. This kind of large family is called an “extended family” or a “joint family”. The joint family includes all living relatives on either the mother’s or the father’s side of the family. It is made up of grandparents, parents, brothers, sisters, uncles, aunts and cousins. They live together in a large house or in huts built close together. Early people probably lived in joint families. They had to be part of a large group in order to survive. The members of the group helped each other hunt. They worked together to protect themselves from dangerous animals and other enemies. In developed countries, some people still live in joint families. The members of a joint family share their earnings and property. If one member of the group becomes ill or has bad luck, the others help the person. As in the past, the members of the joint family offer each other help and protection. Question 26: What is the main idea of the passage? A. Family types B. Living in joint families C. Extended family D. Relatives in families Question 27: According to the passage, members of an extended family live ………… A. together B. near one another C. far from one another D. close to the city center Question 28: Which of the following is NOT true about early people? A. They hunted in groups. B. They fought against wild animals. C. They had enemies. D. They joined other families. Question 29: There is a term that is defined in the passage. What is it? A. family group B. extended family C. large house D. bad luck Question 30: According to the passage, which is shared among joint family members? A. Possessions B. Earrings C. Luck D. Hope Mark the letter A, B, C or D that needs correction in each of the following questions. Question 31: My father used to giving me some good advice whenever I had a problem. A. giving B. some good C. whenever D. a Question 32: George hasn’t completed the assignment yet, and Maria hasn’t too. A. hasn’t B. the assignment yet C. and D. hasn’t too Question 33: The teacher asked him why hadn’t he done his homework, but he said nothing. A. why B. hadn’t he done C. but D. said nothing Question 34: The doctor advised him to avoid eating fatty foods, having more fresh vegetables and drink much water. A. advised him B. eating C. having D. drink much

Vẽ phong cảnh bằng màu gouache Chụp màu bạn sd nhé.

Câu mười chín đang cần có một chấm xanh :>>>> (Tức là giải hộ em c19 đó ạ)

Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến