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\(1)\left(x+1\right)^3-\left(x-1\right)^3-6\left(x-1\right)\left(x-1\right)\\ =x^3+3x^2+3x+1-x^3+3x^2-3x+1-6\cdot\left(x-1\right)^2\\ =6x^2+2-6\cdot\left(x^2-2x+1\right)\\ =6x^2+2-6x^2+12x-6\\ =12x-4\)
\(2)x\left(x-1\right)\left(x+1\right)-\left(x+1\right)\left(x^2-x+1\right)\\ =x\left(x^2-1\right)-\left(x^3+1\right)\\ =x^3-x-x^3-1\\=-x-1\)
\(3)\left(x-1\right)^3-\left(x+2\right)\left(x^2-2x+4\right)+3\left(x-4\right)\left(x+4\right)\\ =x^3-3x^2+3x-1-(x^3+8)+3\cdot\left(x^2-16\right)\\ =x^3-3x^2+3x-1-x^3-8+3x^2-48\\ =3x-55\)


a: =x^2+2x-15-x^2+4
=2x-11
b: =x^2-4x+4+x^2+6x+9-2(x^2-1)
=2x^2+2x+13-2x^2+2
=2x+15
c: \(=x^2-4x+4+x^3-1-x^3+4x\)
=x^2+3
d: \(=\left(2x+5-2x+1\right)^2=6^2=36\)
e: \(=x^3+1-x^3+1-x^2=2-x^2\)

\(P=\left(x+2\right)^3+\left(x-2\right)^3-2x\left(x^2+12\right)\)
\(P=\left[\left(x+2\right)+\left(x-2\right)\right]\left[\left(x+2\right)^2-\left(x+2\right)\left(x-2\right)+\left(x-2\right)^2\right]-2x^3-24x\)
\(P=2x\left(x^2+4x+4-x^2+4+x^2-4x+4\right)-2x^3-24x\)
\(P=2x\left(x^2+12\right)-2x^3-24x\)
\(P=2x^3+24x-2x^3-24x\)
\(P=0\)
=> P không phụ thuộc vào biến x
\(Q=\left(x-1\right)^3-\left(x+1\right)^3+6\left(x+1\right)\left(x-1\right)\)
\(Q=\left[\left(x-1\right)-\left(x+1\right)\right]\left[\left(x-1\right)^2+\left(x-1\right)\left(x+1\right)+\left(x+1\right)^2\right]+6\left(x^2-1\right)\)
\(Q=-2\left(x^2-2x+1+x^2-1+x^2+2x+1\right)+6x^2-6\)
\(Q=-2\left(3x^2+1\right)+6x^2-6\)
\(Q=-6x^2-2+6x^2-6\)
\(Q=-8\)
=> Q không phụ thuộc vào biến x
\(N=y\left(x^2-y^2\right)\left(x^2+y^2\right)-y\left(x^4-y^4\right)\)
\(N=y\left(x^4-y^4\right)-y\left(x^4-y^4\right)\)
\(N=0\)
=> N không phụ thuộc vào biến y
\(M=\left(x-1\right)^3-\left(x-1\right)\left(x^2+x+1\right)-3\left(1-x\right)x\)
\(M=x^3-3x^2+3x-1-x^3+1-3x+3x^2\)
\(M=0\)
=> M không phụ thuộc vào biến x
\(H=\left(x+1\right)^3-\left(x-1\right)^3-3\left[\left(x-1\right)^2+\left(x+1\right)^2\right]\)
\(H=x^3+3x^2+3x+1-x^3+3x^2-3x+1-3\left(x^2-2x+1+x^2+2x+1\right)\)
\(H=6x^2+2-3\left(2x^2+2\right)\)
\(H=6x^2+2-6x^2-6\)
\(H=-4\)
=> H không phụ thuộc vào biến x

3. ( 22 + 1 ).( 24 + 1 ).( 28 + 1 )......( 264 + 1 ) + 1
= ( 22 - 1 ).( 22 + 1 ).( 24 + 1 ).( 28 + 1 )....( 264 + 1 ) + 1
= ( 24 - 1 ).( 24 + 1 ).( 28 + 1 )......( 264 + 1 ) + 1
= ( 28 + 1 ).....( 264 + 1 ) + 1
= ( 264 - 1 ).( 264 + 1 ) + 1
= 2128 - 1 + 1
= 2128
8.( 32 + 1 ).( 34 + 1 ).( 38 + 1 )....( 3128 + 1 ) + 1
= ( 32 - 1 ).( 32 + 1 ).( 34 + 1 ).( 38 + 1 )....( 3128 + 1 ) + 1
= ( 34 - 1 ).( 34 + 1 ).( 38 + 1 )....( 3128 + 1 ) + 1
= ( 38 - 1 ).( 38 + 1 )....( 3128 + 1 ) + 1
= ( 316 - 1 )......( 3128 + 1 ) + 1
= ( 3128 - 1 ).( 3128 + 1 ) + 1
= 3256 - 1 + 1
= 3256

Bài 3:
a: \(=\left(x^3-1\right)\left(x^3-8\right)\)
\(=\left(1-1\right)\left(1-8\right)=0\)
b: \(=x^3-3x^2+3x-1-4x^3+4x+3\left(x^3-1\right)\)
\(=-3x^3-3x^2+7x-1+3x^3-3\)
\(=-3x^2+7x-4\)
\(=-3\cdot4-14-4=-30\)
\(\left(1-x\right)\left(1+x\right)\left(1+x^2\right)\)
\(=\left(1-x^2\right)\left(1+x^2\right)\)
\(=1-x^4\)
( 1 - x )( 1 + 1x )( 1 + x2 )4
= ( 1 - x2 ) ( 1 + x2 )
= ( 1 - x4 )
Hok tốt