Ta có: `f(x-1)=x^2 + 3x - 2`
Đặt `t=x-1⇔x=t+1`
`=>f(t)=(t+1)^2 + 3(t+1)-2=t^2 + 5t +2`
`=>f(x)=x^2 + 5x - 2`
Vậy....
$\begin{array}{l} f\left( {x - 1} \right) = {x^2} + 3x - 2\\ f\left( {x - 1} \right) = {x^2} - 2x + 1 + 5x - 3\\ f\left( {x - 1} \right) = {\left( {x - 1} \right)^2} + 5\left( {x - 1} \right) + 2\\ \Rightarrow f\left( x \right) = {x^2} + 5x + 2 \end{array}$
21. She and I (like).............. (watching)..................... TV very much. 22. Where she (go)............? – she (go)................ to the theatre. 23. Mai (go) ..........to school in the morning. She (not go).....to school in the afternoon. 24. What ...she (do) .........on the weekend? She (go).................camping with her friends 25. They (play) ...........volleyball in the school yard now. 26. How often .......he (go) .......swimming? twice a week.
viết tranh này bằng tiếng anh bằng quá khứ đơn
. Despite her young age, she performs excellently. (Rewrite the sentence, using the word given “ALTHOUGH”) __________________________________________________________________ 3. I thought the ending of the film is quite shocking. (Rewrite the sentence, using the word given “AT”) __________________________________________________________________ 4. Children/ must/ learn/ road safety/ before/ allowed/ ride/ bike/ road/./ (Write the sentence, using the cues given) __________________________________________________________________
11. My sister always (wear) nice clothes for work. Today she (wear)........... a blue jacket and shirt. 12. Why you (buy).............. so much food? - Because we (have)..............a party tonight. 13. That film (come)............... to the local cinema next week. You (want)............ to see it? 14. It (not rain)..........right now. The sun (shine)................ and the sky is blue. 15. Alice (not take).................the bus to school every day. She usually (walk).......... instead. 16. She (go).............. to school everyday. 17. Bad students never (work)........................ hard. 18. It often (rain)............... in summer. It (rain)...................... now. 19. He (not have)...................... any car. 20. What you often (do)............... in the morning?
A=[(√a+3)/(√a+2) + (4a√a+3a+9)/(a-√a-6)] : [√a/(√a+3) + (2√a+3)/(a+5√a+6)] a)rút gọn. b )tìm a để A =48
Giúp em bài này với ạ, em đang cần gấp
mọi người ơi chỉ tui đi mọi người ko biết làm câu này hả mn
Cho hình vẽ bên, biết góc A = 30 độ, góc AQB= 35 độ. Số đo của cung nhỏ CQ là
helppppppppppppppppppppppppppppppp rút gọn
nhanh hộ em với các bác.em đang cần gấp
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
