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1. \(f\left(x\right)=x+x^2-6x^3+3x^4+2x^2+6x-2x^4+1\)
\(\Rightarrow f\left(x\right)=7x+3x^2-6x^3+x^4+1\)
Sắp xếp theo lũy thừa giảm dần của biến x:
\(f\left(x\right)=x^4-6x^3+3x^2+7x+1\)
2. Bậc của đa thức: 4
Hệ số tự do: 1
Hệ số cao nhất: 7
3. \(f\left(-1\right)=\left(-1\right)^4-6.\left(-1\right)^3+3.\left(-1\right)^2+7.\left(-1\right)+1=4\)
\(f\left(0\right)=0^4-6.0^3+3.0^2+7.0+1=1\)
\(f\left(1\right)=1^4-6.1^3+3.1^2+7.1+1=6\)
\(f\left(-a\right)=\left(-a\right)^4-6.\left(-a\right)^3+3.\left(-a\right)^2+7.\left(-a\right)+1=3a+1\)
\(\)
a. cậu thu gọn bằng cách dùng t/c kết hợp và giao hoán
b. cậu thay từng giá vào biểu thức vừa được rút gọn để tìm
c. thì.... tớ ko biết
Thay x= 1 vào f(x), có:
f(x) = 14+2.13-2.12-6.1-5
f(x) = 1 + 2 - 2 - 6 - 5
f(x) = -10
=> x = 1 không phải là nghiệm của f(x)
Thay x = - 1 vào f(x); có:
f(x) = (-1)4+2.(-1)3-2.(-1)2-6.(-1) - 5
f(x) = 1 - 2 - 2 + 6 - 5
f(x) = -2
=> x = -1 không phải là nghiệm của f(x)
...
rùi bn lm típ nha! mk chỉ bk cách này thoy!
I.Each sentence below contains an error.Underline it and write the correct answer in the provided
Example0: There \(\dfrac{are}{ }\) an art gallery in our neighbourhood
0/is
1. I find carve=>carving eggshells boring because it takes a lot of time to complete one shell
2. My brother not goes=>doesn't go to class to learn how to paint
3. I take up=>took up this hobby when i came back home from the Art Gallery
4. I think playing volleyball interest=>interesting because it is a team game
5. In my opinion,more people played=>will play monopoly in the future
II.Fill each blank inthe following letter with a suitable word
Dear Mira,
Thanks for your letter.Now I'll tell you ABOUT my hobbies.My favourite hobby is skitting.It's trange,isn't it? My mother TAUGHT me to knit two years ago.Now I can knit scraves and seaters.It's great when I can GAVE them to my relatives and friends as gifts.Knitting is also imaginative AS you can knit anything you can imagine of.Besides,it is quite cheap.You only NEED a pair of needles and some wool.
I'm sending you a scarf next month.I'm knitting it.I hope you'll like it.
Best wishes,
Vy
a) \(P\left(x\right)=2+5x^2-3x^3+4x^2-2x-x^3+6x^5\)
\(=6x^5-4x^3+9x^2-2x+2\)
b) \(P\left(1\right)=6\cdot1^5-4\cdot1^3+9\cdot1^2-2\cdot1+2\)
\(=6-4+9-2+2\)
\(=11\)
Exercise1:
1)Many people began to wearing jeans because they were cheap.
=>Because of...cheapness, many people began to wearing jeans....
2)Since he was careless,Tom lost the game.
=>Because of......Tom's carelessness, he lost the game........
3)Although she behaves well,no one loves her.
=>Despite....behaving well , no one loves her
4)Because of the cold weather,the crops are late this year.
=>Because ..the weather is cold......
5)Mary was worried because Tom was late.
=>Because of...Tom's lateness, mary was worried...
6)Tom walked slowly because his leg was bad.
=>Because of...Tom's bad leg, he walked slowly...
7)I came here because I want the English course.
=>Because of...wanting the English course, I came here...
8)I went to school although it was hot
=>Despite..the hot weather, I went to school....
9)Because of the dust in the room,I can't go in.
=>Because there is the dust in the room, I can't go in
10)Because of too much smoke,we have to wear masks.
=>Because......there is too much....
Exercise2:Điền although,in spite of/despite.
1)although the weather was bad,we enjoyed our trip.
2)The children slept well depite the noise.
3)in spite of earning a low salary,Linda gave money to her parents.
4)John rarely sees Paul although they live in the same town.
5)Julie failed the exam in spite of working very hard.
6)although it was cold,she didn't put on her coat.
7)Tom went to work depite not feeling very well.
8)Anna never learned the language although she lived there for two years.
Exercise1:
1)Many people began to wearing jeans because they were cheap.
=>Because of......jeans' price, many people began to wear them........
2)Since he was careless,Tom lost the game.
=>Because of.......his carelessness, Tom lost the game.......
3)Although she behaves well,no one loves her.
=>Despite........her good behavior, no one loves her........
4)Because of the cold weather,the crops are late this year.
=>Because ......the weather is cold, the crops are late this year........
5)Mary was worried because Tom was late.
=>Because of......Tom's being late, Mary was worried........
6)Tom walked slowly because his leg was bad.
=>Because of.......his bad leg, Tom walked slowly.......
7)I came here because I want the English course.
=>Because of......the English course, I came here........
8)I went to school although it was hot
=>Despite........the hot weather, I went to school........
9)Because of the dust in the room,I can't go in.
=>Because .......there is dust in the room, I can't go in.......
10)Because of too much smoke,we have to wear masks.
=>Because.........there is too much smoke, we have to wear masks.........
Exercise2:Điền although,in spite of/despite.
1) Although the weather was bad,we enjoyed our trip.
2)The children slept well despite the noise.
3) Despite earning a low salary, Linda gave money to her parents.
4)John rarely sees Paul although they live in the same town.
5)Julie failed the exam in spite of working very hard.
6) Although it was cold,she didn't put on her coat.
7)Tom went to work despite not feeling very well.
8)Anna never learned the language although she lived there for two years.
dù bạn đăng nhầm nhưng mình vẫn trả lời nha !
a) f(x)- g(x)+h(x) = (x3-2x2+3x+1)-(x3+x-1)+(2x2-1)
f(x)- g(x)+h(x) = x3-2x2+3x+1- x3-x+1+2x2-1
f(x)- g(x)+h(x)= (x3-x3) +(2x2-2x2) +(3x-x)+(1+1-1)
f(x)- g(x)+h(x) = 0+0+2x+1
f(x)- g(x)+h(x) = 2x+1
b) Xét f(x)- g(x)+h(x)=0
Suy ra: 2x+1=0
2x= -1
x = - \(\dfrac{1}{2}\)
Đây là Tiếng Anh mà bn ???