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\(8-27x^3\)
\(=2^3-\left(3x\right)^3\)
\(=\left(2-3x\right)\left(4+6x+9x^2\right)\)
a) \(8-27x^3=\left(2-x\right)\left(4+6x+9x^2\right)\)
b) \(27+27x+9x^2+x^3=\left(3+x\right)^3\)
c) \(x^3+8y^3=\left(x+2y\right)\left(x^2-2xy+4y^2\right)\)
a) \(x^3+6x^2+12x+8\)
\(=\left(x+2\right)^3\)
b) \(x^3-3x^2+3x-1\)
\(=\left(x-1\right)^3\)
c) \(1-9x+27x^2-27x^3\)
\(=-\left(27x^3-27x^2+9x-1\right)\)
\(=-\left(3x-1\right)^3\)
a, \(x^3-3x^2+3x-1=\left(x-1\right)^3\)
b, \(1-9x+27x^2-27x^3=-\left(3x-1\right)^3\)
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a,\(0,04x^2-64y^2=\left(0,2x\right)^2-\left(8y\right)^2=\left(0,2x-8y\right)\left(0,2x+8y\right)\)
b,\(-x^3+9x^2-27x+27=-x^3+3x^2+6x^2-18x-9x+27\)
\(=-x^2\left(x-3\right)+6x\left(x-3\right)-9\left(x-3\right)=\left(-x^2+6x-9\right)\left(x-3\right)\)
\(=-\left(x-3\right)^3\)
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\(x^3+\frac{1}{x^3}=x^3+\left(\frac{1}{x}\right)^3=\left(x+\frac{1}{x}\right)\left(x^2-x+\frac{1}{x^2}\right)\)( x khác 0 )
\(-x^3+9x^2-27x+27=-\left(x^3-9x^2+27x-27\right)=-\left(x-3\right)^3\)
\(\left(xy+1\right)^2-\left(x-y\right)^2=\left(xy+1-x+y\right)\left(xy+1+x-y\right)\)
a)27x3+27x2+9x+1+x+1/3
=(3x+1)3+1/3(3x+1)
=(3x+1)[(3x+1)2+1/3]
=(3x+1)(9x2+6x+4/3)
b)8xy3-5xyz-24y2+15z
=(8xy3-24y2)-(5xyz-15z)
=8y2(xy-3)-5z(xy-3)
=(xy-3)(8y2-5z)
c)x4+x3+x+1
=x3(x+1)+(x+1)
=(x+1)(x3+1)
=(x+1)(x+1)(x2-x+1)
=(x+1)2(x2-x+1)
d)a6-a4-2a3+2a2
=a4(a-1)(a+1)-2a2(a-1)
=(a-1)(a5+a4-2a2)
=(a-1)(a5-a4+2a4-2a2)
=(a-1)[a4(a-1)+2a2(a-1)(a+1)]
=(a-1)(a-1)(a4+2a3+2a2)
=(a-1)2(a4+2a3+2a2)
\(x^4+x^3+x+1\)
\(=x^3\left(x+1\right)+\left(x+1\right)\)
\(=\left(x+1\right)\left(x^3+1\right)\)
\(=\left(x+1\right)^2\left(x^2-x+1\right)\)
\(x^3-27x-54\)
\(=x^3-6x^2+6x^2-36x+9x-54\)
\(=x^2\left(x-6\right)+6x\left(x-6\right)+9\left(x-6\right)\)
\(=\left(x-6\right)\left(x^2+6x+9\right)=\left(x-6\right)\left(x+3\right)^2\)
\(4x^3-13x^2+9x-18\)
\(=4x^3-12x^2-x^2+3x+6x-18\)
\(=4x^2\left(x-3\right)-x\left(x-3\right)+6\left(x-3\right)\)
\(=\left(x-3\right)\left(4x^2-x+6\right)\)
27x3 + 27x2 + 9x + 1 + x + 1/3
= ( 27x3 + 27x2 + 9x + 1 ) + 1/3( 3x + 1 )
= ( 3x + 1 )3 + 1/3( 3x + 1 )
= ( 3x + 1 )[ ( 3x + 1 )2 + 1/3 ]
= ( 3x + 1 )( 9x2 + 6x + 1 + 1/3 )
= ( 3x + 1 )( 9x2 + 6x + 4/3 )