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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) \(P\left(1\right)=6\cdot1^5-4\cdot1^3+9\cdot1^2-2\cdot1+2\)
\(=6-4+9-2+2\)
\(=11\)
1, để 2-x chia het cho x+ 1 thi
2-x = 2 - ( x + 1 )
mà x + 1 chia het cho x+ 1
s ra x+ 1 thuộc u của 2
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 = - \(\dfrac{1}{2}\)
3/2:Feberury the third
20/11:November the twentieth
30/4:April the thirtieth
22/12:December the twenty-second
2/9:September the second
26/3:Match the twenty-sixth
19/8:August the nineteenth
10/10:October the tenth
7/5:May the seventh
27/7:July the twenty-seventh
1. 3/2............the third of Febulary............
2. 20/11............the.twentyth of November............
3. 30/4...........the thirty of April..................
4. 22/12......the twenty - second of December............
5. 2/9...........the second of September.................
6. 26/3.........the twenty- sixth of March.............
7. 19/8........the nineteenth of August........
8. 10/10........the tenth of October..........
9. 7/5 ............the seventh of May............
10. 27/7.................the twenty-seventh of July....................
1. 3/2 ..............the third of February.................
2. 20/11 ......the twentieth of November..................
3. 30/4 ..........the thirtieth of April...............
4. 22/12 ..the twenty second of December..............
5. 2/9 .........the second of September................
6. 26/3 ........the twenty sixth of March...............
7. 19/8 ............the nineteenth of August.................
8. 10/10 .........the tenth of October...................
9. 7/5 ...........the seventh of May..................
10. 27/7 .........the twenty seventh of July................
Em hãy viết theo cách đọc những ngày tháng sau.
Ví dụ: 1/1: the first of January
1. 3/2 : The third of February .
2. 20/11 : The twentith - two of November .
3. 30/4 : The thirtith of April .
4. 22/12 : The twentith - two of December .
5. 2/9 : The second of September .
6. 26/3 : The twentith of March
7. 19/8 : The nineteenth of August
8. 10/10 : The tenth of October .
9. 7/5 : The seventh of May
10. 27/7 : The twentith - seven of July.
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. \(f\left(-1\right)=\left(-1\right)^4-6.\left(-1\right)^3+3.\left(-1\right)^2+7.\left(-1\right)+1=4\)
\(f\left(0\right)=0^4-6.0^3+3.0^2+7.0+1=1\)
\(f\left(1\right)=1^4-6.1^3+3.1^2+7.1+1=6\)
\(f\left(-a\right)=\left(-a\right)^4-6.\left(-a\right)^3+3.\left(-a\right)^2+7.\left(-a\right)+1=3a+1\)
\(\)
\(\left(4x+5\right)+\left(3x-19\right)=0\)
\(4x+5+3x-19=0\)
\(7x-14=0\)
\(7x=14\)
\(x=2\)
4x+5+3x-19=0
<=>7x-14=0
=>x=2
học tốt