Đáp án:
Phía dưới
Giải thích các bước giải:
` A=x(1-2x)`
`A=x-2x^2`
`A=x-2x^2-1/8+1/8`
`A=-2(x^2-1/2x+1/16)+1/8`
`A=-2[x^2-2. 1/4x+(1/4)^2]+1/8`
`A=1/8-2(x-1/4)^2 ≤1/8`
Dấu `=` xảy ra khi và chỉ khi `x-1/4 =0 ⇔x=1/4`
Vậy `A_(max)=1/8` khi `x=1/4`
Đáp án `+` Giải thích các bước giải `!`
`A= x(1-2x)`
`= x-2x^2`
`= -2x^2+x`
`= -2(x^2-(1)/(2)x)`
`= -2(x^2-(1)/(2)x+1/(16)-1/(16))`
`= -2(x^2-(1)/(2)x+1/(16))+1/8`
`= -2(x-1/4)^2+1/8`
Vì `-2(x-1/4)^2 <= 0` `AA x`
`=> -2(x-1/4)^2+1/8 <= 1/8`
Dấu `\text{"="}` xảy ra:
`<=> -2(x-1/4)^2 = 0`
`<=> x-1/4 = 0`
`<=> x = 1/4`
Vậy $Max_A$ `=1/8 <=> x=1/4`
Mng giúp mình vt 1 đoạn văn tiếng anh về bất đồng ngôn ngữ do khoảng cách thế hệ với
Put in the correct preposition: 1- I was delighted ................... the present you gave me. 2- It was very nice .................. you to do my shopping. 3- Why are you rude .................. your sisters? Can’t you be nice ............... them? 4- Were you disappointed ................ your exam results? 5- We always have the same food every day. I’m fed up ................ it. 6- I can’t understand the people who are cruel ............... animals. 7- Are you angry .................. what happened? 8- I’m sorry .............. what that I said. I hope you’re not angry ............. me. 9- Linda doesn’t look very well. I’m worried ................. her. 10- It was a bit careless ............... you to leave the door unlocked. 11- It is good .................. you to be so helpful. 12- The people next door are furious .............. us ............ making so much noise last night. 13- Are you excited .......... going on holiday next week? 14- I was shocked .............. what I saw. 15- We weren’t very impressed ................. his appearance. 16- Are you still upset ................ what I said to you? 17- I felt sorry ................ the children when we went .......... holiday. 18- His letter was full ........... mistakes. 19- The Italian city of Florence is famous ............ its art treasures 20- Kate is very fond ............. her younger brother. 21- Are you afraid ............. snakes. –Yes, I’m terrified ............. them. 22- You don’t seem interested ................ what I’m saying. 23- Did you know that Liz is engaged .............. a friend of mine? 24- I’m not ashamed ................ what I did. In fact I’m quite proud ............. it. 25- I suggested we should all go out for a meal but nobody else was keen ............ the idea. 26- These days everybody is awere ................ the dangers of smoking. 27- The station was crowded ............... people waiting for the train. 28- Why are you always so jealous ................. other people? 29- I’m tired ............ doing the same thing every day. 30- Her children have all been successful ............. their chosen careers. 31- I’m a bit short ............... money. Can you lend me some? 32- I’m not very good ............. repairing things. 33- The film is different ................. what I’d expected. 34- I’m sure you are capable ................. passing the exam. 35- Who was responsible ................ all that noise last night? 36- Our house is similar ................. your. Perhaps yours is a bit larger. 37- She’s totally dependent ................ her parents. 38- The fungus is not harmful ................ humans. Smoking is harmful ............. your health. 39- Many young people want to be independent ................. their parents nowadays. 40- I’m very grateful ............ her ................ her help. 41- He didn’t trust me. He was suspicious .................. my intentions. 42- The meeting will begin ................. 8.30 sharp. 43- I didn’t know that the man told us a lie ..................... yesterday. 44- A strange noise woke me up ............... midnight. 45- A man was sitting ................ the roof of the house and laughing. 46- Their head office is ....................... the eleventh floor of an eighteen-storey building.
So sánh khổi lượng của a.Nguyên tử Canxi và với nguyên tử Natri B.Nguyên tử sắt với 2 nguyên tử kali c. 3 nguyên tử lưu huỳnh(S) với nguyên từ đồng d.2Fc và 4CL e.5F và 8C f. 10K và 20N
Giúp mình làm nhanh lên nha. cảm ơn
PTBĐ đoạn "Bố nhớ cách đây mấy năm...để cứu sống con" văn bản "Mẹ tôi" ạ
I.Write a letter to your friend telling him about How Vietnamese people celebrate Tet. Uses as many complex sentences as possible. (about 100 words) Mk cần gấp( viết nư 1 bức thư ạ,có Dear,hỏi thăm sức khỏe) Ko đc chép mạng
Em hãy giới thiệu đôi nét về đất nước Ấn Độ ( Vị trí địa lý, diện tích, dân số,Văn hóa)
mik đang cần gấp :< ai trả lời trước mik cho ctlhn
một tấm bìa hình vuông có chu vi là 112 cm.Chia tấm bìa ra thành hai hình chữ nhật có hiệu hai chu vi là 16 cm. tính chu vi tấm bìa nhỏ
Giúp em câu 3 với ạ làm chi tiết và có tâm giúp e
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
