`1)` `x^3+5x^2-4x-20=0`
`=>x^2(x+5)-4(x+5)=0`
`=>(x+5)(x^2-4)=0`
`=> (x+5)(x+2)(x-2)=0`
`=>\(\left[ \begin{array}{l}x=-5\\x=-2\\x=2\end{array} \right.\)
`2)` `x^3+3x^2-3x-1=?`
Thiếu đề nha bn
VD: `x^3+3x^2-3x-1=2`
`=>x^3+3x^2-3x-3=0`
`=>x^2(x+3)-3(x+3)=0`
`=>(x+3)(x^2-3)=0`
`=>`\(\left[ \begin{array}{l}x+3=0\\x^2-3=0\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=-3\\x=±\sqrt{3}\end{array} \right.\)
Đáp án + Giải thích các bước giải:
1)
`x^3+5x^2-4x-20=0`
`=>(x+5)(x-2)(x+2)=0`
`=>x+5=0` hoặc `x-2=0` hoặc `x+2=0`
`=>x=-5` hoặc `x=2` hoặc `x=-2`
Vậy `S={-5;2;-2}`
2)
Thiếu đề ạ (không có dấu `=`)
Cho A= (4n+3)^2 - 25. Chứng minh A chia hết cho 8 với mỗi n là số nguyên.
Viết 1 bài luận khoảng 150-180 từ về hình ảnh trên
Thực hiện phép tính a) $\frac{1}{2}$ $x^{2}$ $y^{2}$ (2x + y ) ( 2x- y ) b) ( $\frac{1}{2}$ x - 1) (2x - 3 ) c) (x-7 ) ( x - 5 ) d) ( x- $\frac{1}{2}$ ) ( x + $\frac{1}{2}$ ) (4x - 1 ) Dạng đa thức nhân đa thức mn đưng lam tắt e không hiểu ạ
ptich hình tượng vua Quang Trung trong Hoàng lê nhất thống chí k copy mạng nhé
1. Rafael Display virtual keyboard interface (go) shopping for me yesterday. 2. Sandra Display virtual keyboard interface (lend) her brother `£200 so far. 3. The policeman Display virtual keyboard interface (drive) away ten minutes ago. 4. The biscuit factory Display virtual keyboard interface(close) down last year. 5. She's very red. I think she Display virtual keyboard interface (lie) in the sun. 6. Ron Display virtual keyboard interface (just/ pass) his driving test. 7. Karen Display virtual keyboard interface (study) Italian for three years now and is still studying. 8. The Headmaster Display virtual keyboard interface (come) to this school in 2004. 9. Jack Display virtual keyboard interface (try) to get a job for six months, but is still unemployed. 10. The teacher Display virtual keyboard interface (already / tell) him to be quiet. 11. Tim Display virtual keyboard interface (not/take) many photos yet. 12. Oh no! I Display virtual keyboard interface (leave) my purse at home. 13. They Display virtual keyboard interface (fall) in love with each other at first sight 2 years ago. 14. I don't want to have a bath because I Display virtual keyboard interface (just / have) a shower. 15. I'm sorry I Display virtual keyboard interface (forget) your name. What did you say it was?
Giúp mình nha mng ơi,cảm ơn nhiều ạ
Cho biểu thức A= 5(x+3) (x-3) +(2x+3)^2 +(x-6)^2. Rút gọn rồi tính giá trị biểu thức A với x= -1/5
1. Complete the sentences with the verb + -ing. do / go / play / ski / swim / watch 1. Susan hates boxing but she loves football. 2. I don’t like in the pool at the sports centre. 3. Does she like shopping in the supermarket? 4. Peter loves judo. 5. They enjoy the Olympics on TV Giúp mik với!!!!!!!
1. Hoa doesn’t get up late now (used to) Hoa.............................................................................................. 2. We have never been to Lan’s village before. (time) It
giải hộ mình với mình cân gấp mình cảm ơn
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
