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(x^2+1)^2 - 4x(1-x^2)
=(x^2-1)^2 + 4x^2 + 4x(x^2-1)
(=(x^2-1+2x)^2
=((x-1)^2)^2
=(x-1)^4
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\(x^{200}\)+ \(x^{100}\)+\(1\)
<=>\(x^{100}\)(\(x^{100}\)+\(1\)) +\(1\)
<=> (\(x^{100}\)+\(1\))(\(x^{100}\)+\(1\))
<=> \(\left(x^{100}+1\right)^2\)
Chúc bạn học tốt ~<>
Ta có :
\(x^{200}+x^{100}+1\)
\(\Rightarrow x^{100}.\left(x^{100}+1^1\right)+1\)
\(\Rightarrow\left(x^{100}+1\right).\left(x^{100}+1\right)\)( bạn nhân phân phối là ra nhé )
\(\Leftrightarrow\left(x^{100}+1\right)^2\)
Vậy nhân tử của đa thức \(x^{200}+x^{100}+1\)là \((x^{100}+1)^2\)
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x200+x100+1 = x200+x100+x100+1-x100=(x100+1)2-x100
=(x100+1)2-(x50)2 =(x100+1-x50)(x100+1+x50)
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a) \(x^5+x+1=x^5+x^2-x^2+x+1\)
\(=\left(x^5-x^2\right)+\left(x^2+x+1\right)\)
\(=x^2\left(x^3-1\right)+\left(x^2+x+1\right)\)
\(=x^2\left(x-1\right)\left(x^2+x+1\right)+\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left[x^2\left(x-1\right)+1\right]\)
\(=\left(x^2+x+1\right)\left(x^3-x^2+1\right)\)
b) \(x^7+x^2+1=x^7+x^2-x+x+1\)
\(=\left(x^7-x\right)+\left(x^2+x+1\right)\)
\(=x\left(x^6-1\right)+\left(x^2+x+1\right)\)
\(=x\left(x^3+1\right)\left(x^3-1\right)+\left(x^2+x+1\right)\)
\(=x\left(x^3+1\right)\left(x-1\right)\left(x^2+x+1\right)+\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left[x\left(x^3+1\right)\left(x-1\right)+1\right]\)
\(=\left(x^2+x+1\right)\left(x^5+x^2+1-x^4-x\right)\)
(Nếu đúng thì k cho mìk với nhé!)
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(2x+1)^2-(x-1)^2
= (4x^2 + 4x +1) - (x^2 - 2x +1)
= 2x^2 + 6x
= 2x(x+3)
9(x+5)^2-(x-7)^2
= 9 (x^2 + 10x + 25) - (x^2 - 14x +49)
= 9x^2 + 90x + 225 - x^2 + 14x - 49
= 8x^2 + 104x + 176
= 8x^2 + 8 * 13x + 8 * 22
= 8(x^2 + 13x +22)
x^2-y^2-x+y
= (x^2 - y^2) - (x-y)
= (x-y) (x+y) - (x-y)
= (x-y) (x+y+1)
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(x2 - x + 1)2 - 5x(x2 - x + 1) + 4x2
Đặt x2 - x + 1 = a
<=> a2 - 5xa + 4x2 = x2 - 4xa - xa + 4x2
= a(a - 4x) - x(a - 4x) = (a - x)(a - 4x)
= (x2 - x + 1 - x)(x2 - x + 1 - 4x)
= (x2 - 2x + 1)(x2 - 5x + 1) = (x - 1)2(x2 - 5x + 1)
Đặt x2 - x + 1 = y
đthức <=> y2 - 5xy + 4x2
= y2 - xy - 4xy + 4x2
= y( y - x ) - 4x( y - x )
= ( y - x )( y - 4x )
= ( x2 - x + 1 - x )( x2 - x + 1 - 4x )
= ( x2 - 2x + 1 )( x2 - 5x + 1 )
= ( x - 1 )2( x2 - 5x + 1 )
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a)đề sai
b)4x(x-2y)+8y(2y-x)
=4x2-8xy+16y2-8xy
=16y2-16xy+4x2
=4(4y2-4xy-x2)
=4(2y-x)2
c)3x(x+1)^2-5x^2(x+1)+7(x+1)
=(3x2+3x)(x+1)-(x+1)(5x2+7)
=(x+1)(3x2+3x-5x2+7)
=(x+1)(-2x2+3x+7)
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\(x\left(x-1\right)+1\)
\(=x^2-x+1\)
\(=x^2-2.\frac{1}{2}x+\frac{1}{4}+\frac{3}{4}\)
\(=\left(x-\frac{1}{2}\right)^2+\frac{3}{4}>0\)
Vậy đa thức trên k phân tích thành nhân tử đc
\(x\left(x-1\right)+1\)
\(=x^2-x+1\)
\(=\left(x-\frac{1}{2}\right)^2+\frac{3}{4}>0\)
=> ko phân tích đc thành nhân tử