phân tích đa thức thành nhân tử
\(x^5-2x^4+3x^3-4x^2+2\)
\(x^4+1997x^2+1996x+1997\)
\(x^2-x-2015\times2016\)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
bn chép lại đề nha
\(=x^4-x+1997\left(x^2+x+1\right)\)
\(=x\left(x-1\right)\left(x^2+x+1\right)+1997\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+1997\right)\)
xong nha. chúc bn hc tốt
a) \(x^4+1997x^2+1996x+1997\)
\(=\left(x^4-x\right)+\left(1997x^2+1997x+1997\right)\)
\(=x\left(x^3-1\right)+1997\left(x^2+x+1\right)\)
\(=x\left(x-1\right)\left(x^2+x+1\right)+1997\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left[x\left(x-1\right)+1997\right]\)
\(=\left(x^2+x+1\right)\left(x^2-x+1997\right)\)
b) \(x^2-x-2015.2016\)
\(=x^2-2016x+2015x-2015.2016\)
\(=\left(x^2-2016x\right)+\left(2015x-2015.2016\right)\)
\(=x\left(x-2016\right)+2015\left(x-2016\right)\)
\(=\left(x-2016\right)\left(x+2015\right)\)
a) \(x^5-2x^4+3x^3-4x^2+2\)
\(=x^5-x^4-x^4+x^3+2x^3-2x^2-2x^2+2\)
\(=x^4\left(x-1\right)-x^3\left(x-1\right)+2x^2\left(x-1\right)-2\left(x-1\right)\left(x+1\right)\)
\(=\left(x-1\right)\left(x^4-x^3+2x^2-2x-2\right)\)
b) \(x^4+1997x^2+1996x+1997\)
\(=\left(x^4+x^2+1\right)+1996\left(x^2+x+1\right)\)
\(=\left(x^2-x+1\right)\left(x^2+x+1\right)+1996\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+1997\right)\)
c) \(x^8+x^4+1\)
\(=x^8+2x^4+1-x^4\)
\(=\left(x^4+1\right)-x^4\)
\(=\left(x^4-x^2+1\right)\left(x^4+x^2+1\right)\)
\(=\left(x^4-x^2+1\right)\left(x^2-x+1\right)\left(x^2+x+1\right)\)
c) \(x^5+x+1\)
\(=x^5-x^2+x^2+x+1\)
\(=x^2\left(x^3-1\right)+\left(x^2+x+1\right)\)
\(=x^2\left(x-1\right)\left(x^2+x+1\right)+\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^3-x^2+1\right)\)
a) x4 + 1997x2 + 1996x +1997
= x4 + 1997x2 + 1997x - x +1997
=(x4-x) + (1997x2 +1997x+1997)
=x(x3-1) + 1997(x2+x+1)
=x(x-1)(x2+x+1) + 1997(x2+x+1)
=(x2+x+1)(x2-x) + 1997(x2+x+1)
=(x2+x+1)(x2-x+1997)
b) x2 -x -2001.2002
=x2 - x -20022 +2002
=(x2-20022)-(x-2002)
=(x-2002)(x+2002) - (x-2002)
=(x-2002)(x+2002+1)
=(x-2002)(x+2003)
c)x8 + 98x4 +1
= (x8+2x4+1) + 96x4
= (x4+1)2 + 96x4
=[(x4+1)2 + 2.(x4+1).8 + 64x4 ]+[32x4 - 16x2(x4+1)]
=(x4+1+8x2)-16x2(-2x2+x4+1)
=(x4+8x2+1)2- 16x2(x2-1)2
=(x4 + 8x2 +1)2- [4x(x2-1)]2
=(x4+8x2+1)2 - (4x3-4x)2
=(x4-4x3+8x2+4x+1)(x4+4x3+8x2-4x+1)
Pt vô nghiệm
=> dùng hệ số bất định hay phân tích có nhân tử là (x2+x+1)
a) Ta có : x2 - 4x + 3
= x2 - x - 3x + 3
= x(x - 1) - (3x - 3)
= x(x - 1) - 3(x - 1)
= (x - 1) (x - 3)
a) \(x^2-4x+3\)
\(=x^2-x-3x+3\)
\(=x\left(x-1\right)-3\left(x-1\right)\)
\(=\left(x-1\right)\left(x-3\right)\)
b) \(x^2+5x+4\)
\(=x^2+x+4x+4\)
\(=x\left(x+1\right)+4\left(x+1\right)\)
\(=\left(x+1\right)\left(x+4\right)\)
c) \(x^2-x-6\)
\(=x^2-3x+2x-6\)
\(=x\left(x-3\right)+2\left(x-3\right)\)
\(=\left(x+2\right)\left(x-3\right)\)
d) \(x^4+1997x^2+1996x+1997\)
\(=x^4+x^2+1996x^2+1996x+1996+1\)
\(=\left(x^4+x^2+1\right)+\left(1996x^2+1996x+1996\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+1\right)+1996\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+1997\right)\)
e) \(x^2-2001\cdot2002\)( hình như sai sai)
mn giúp mình vs mik đang cần gấp
Bạn tự làm cho trung thực đừng dựa vào người khác
Nếu ai thấy những gì mình nói là đúng thì nhớ k nha
Thanks