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a)\(\left(y-z\right)\left(12x^2-6x\right)+\left(y-z\right)\left(12x^2+6x\right)\)
\(=\left(y-z\right)\left(12x^2-6x+12x^2+6x\right)\)
\(=24x^2\cdot\left(y-z\right)\)
\(a,\left(y-z\right)\left(12x^2-6x\right)+\left(y-z\right)\left(12x^2+6x\right)\)
\(=\left(y-z\right)\left(12x^2-6x+12x^2+6x\right)\)
\(=24x^2\left(y-z\right)\)
\(a,=6x\left(x-2\right)-7\left(x-2\right)=\left(6x-7\right)\left(x-2\right)\)
a, x4 . 1 - 2 . 3 . x3 + 3 . 4 . x3 - 2 . 7 . x + 3
= bó tay
\(=\left(x+2\right)^3+y^3\)
\(=\left(x+2+y\right)\left(x^2+4x+4-xy-2y+y^2\right)\)
\(2x-1^3+8\)
\(=2x-9\)
\(=\left(\sqrt{2x}\right)^2-3^2\)
\(=\left(\sqrt{2x}-3\right)\left(\sqrt{2x}+3\right)\)
_________
\(8x^3-12x^2+6x-1\)
\(=\left(2x\right)^3-3\cdot\left(2x\right)^2\cdot1+3\cdot2x\cdot1^2-1^3\)
\(=\left(2x-1\right)^3\)
_______________
\(8x^3-12x^2+6x-2\)
\(=8x^3-12x^2+6x-1-1\)
\(=\left(2x-1\right)^3-1\)
\(=\left(2x-1-1\right)\left(4x^2-4x+1+2x-1+1\right)\)
\(=\left(2x-2\right)\left(4x^2-2x+1\right)\)
\(=2\left(x-1\right)\left(4x^2-2x+1\right)\)
________
\(9x^3-12x^2+6x-1\)
\(=x^3+8x^3-12x^2+6x-1\)
\(=x^3+\left(2x-1\right)^3\)
\(=\left(x+2x-1\right)\left(x^2-2x^2-x+4x^2-4x+1\right)\)
\(=\left(3x-1\right)\left(3x^2-5x+1\right)\)
b: 8x^3-12x^2+6x-1
=(2x)^3-3*(2x)^2*1+3*2x*1^2-1^3
=(2x-1)^3
c: =(8x^3-12x^2+6x-1)-1
=(2x-1)^3-1
=(2x-1-1)[(2x-1)^2+2x-1+1]
=2(x-1)(4x^2-4x+1+2x)
=2(x-1)(4x^2-2x+1)
=(x^3+6x^2+12x+8)+y^3
=(x^3+3x^2+3x2^2+2^3)+y^3
=(x+2)^3+y^3
=(x+2+y)((x+2)^2-(x+2)y+y^2)
=(x+2+y)(x^2+4x+4-xy-2y+y^2)
=(x+2+y)(x^2+y^2-xy+4x-2y+4)
x3 - 6x2 + 12x - 8
= x3 - 2x2 - 4x2 + 4x + 8x - 8
= (x3 - 2x2) - (4x2 - 8x) + (4x - 8)
= x2.(x - 2) + 4x.(x - 2) + 4.(x - 2)
= (x - 2).(x2 + 4x + 4)
= (x - 2).(x2 + 2x + 2x + 4)
= (x - 2).[x.(x + 2) + 2.(x + 2)]
= (x - 2).(x + 2).(x + 2)
= (x - 2).(x + 2)2
\(=\left(x+2\right)^3+y^3\)
\(=\left(x+2+y\right)\left(x^2+4x+4-xy-2y+y^2\right)\)
\(x^3+y^3+6x^2+12x+8\)
=\(x^3+3.2.x^2+3.2^2.x+2^3+y^3\)
\(=\left(x+2\right)^3+y^3=\left(x+2+y\right)\left(\left(x+2\right)^2-\left(x+2\right)y+y^2\right)\)
\(=\left(x+y+2\right)\left(x^2+4x+4-xy-2y-y^2\right)\)