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6 tháng 10 2021

\(a,=8\left(x^3-125\right)=8\left(x-5\right)\left(x^2+10x+25\right)\\ b,=\left(0,1+4x\right)\left(0,01-0,4x+16x^2\right)\\ d,=\left(3x-\dfrac{1}{2}y\right)\left(9x^2+\dfrac{3}{2}xy+\dfrac{1}{4}y^2\right)\\ c,=\left(\dfrac{1}{5}y+x\right)\left(\dfrac{1}{25}y^2-\dfrac{1}{5}xy+x^2\right)\)

6 tháng 10 2021

a, 8x3- 1000 = (2x)3 - 103 = (2x -10). (4x2 + 20x +100)

b,\(0,001+64x^3=\left(\dfrac{1}{10}\right)^3+\left(4x\right)^3=\left(\dfrac{1}{10}+4x\right).\left(\dfrac{1}{100}-\dfrac{2}{5}x+16x^2\right)\)

c, \(\dfrac{1}{125}y^3+x^3=\left(\dfrac{1}{5}y\right)^3+x^3=\left(\dfrac{1}{5}y+x\right).\left(\dfrac{1}{25}y^2-\dfrac{1}{5}yx+x^2\right)\)

\(d,27x^3-\dfrac{1}{8}y^3=\left(3x\right)^3-\left(\dfrac{1}{2}y\right)^3=\left(3x-\dfrac{1}{2}y\right).\left(9x^2+\dfrac{3}{2}xy+\dfrac{1}{4}y^2\right)\)

27 tháng 11 2018

a. \(1-2y+y^2=\left(1-y\right)^2\)

b. \(\left(x+1\right)^2-25=\left(x+1+5\right)\left(x+1-5\right)=\left(x+6\right)\left(x-4\right)\)

c. \(1-4x^2=\left(1+2x\right)\left(1-2x\right)\)

d. \(8-27x^3=\left(2-3x\right)\left(4+6x+9x^2\right)\)

e. \(27+27x+9x^2+x^3=\left(x+3\right)^3\)

f, \(8x^3-12x^2y+6xy^2-y^3=\left(2x-y\right)^3\)

g, \(x^3+8y^3=\left(x+2y\right)\left(x^2-2xy+4y^2\right)\)

27 tháng 11 2018

\(\left(a\right)1-2y+y^2\)

\(\Leftrightarrow y^2-2y+1\)

\(\Leftrightarrow\left(y-1\right)^2\)

\(\left(b\right)\left(x+1\right)^2-25\)

\(\Leftrightarrow\left(x+1\right)^2-5^2\)

\(\Leftrightarrow\left(x-4\right)\left(x+6\right)\)

\(\left(c\right)1-4x^2\)

\(\Leftrightarrow1-\left(2x\right)^2\)

\(\Leftrightarrow\left(1-2x\right)\left(1+2x\right)\)

\(\left(d\right)8-27x^3\)

\(\Leftrightarrow2^3-\left(3x\right)^3\)

\(\Leftrightarrow\left(2-3x\right)\left(4+6x+9x^2\right)\)

\(\left(e\right)27+27x+9x^2+x^3\)

\(\Leftrightarrow\left(x+3\right)^3\)

\(\left(f\right)8x^3-12x^2y+6xy^2-y^3\)

\(\Leftrightarrow\left(2x\right)^3-12x^2y+6xy^2-y^3\)

\(\Leftrightarrow\left(2x-y\right)^3\)

\(\left(g\right)x^3+8y^3\)

\(\Leftrightarrow\left(x+2y\right)\left(x^2-2xy+4y^2\right)\)

27 tháng 11 2018

a) 1 - 2y + y2

= (1-y)2

b) ( x + 1 )- 25

=( x + 1 )- 52

=(x+1+5)(x+1-5)

27 tháng 11 2018

c) 1 - 4x2

= 1- 2x2

=(1-2x)(1+2x)

Bài 2: 

a: \(A=a^2+b^2+c^2+2ab-2ac-2bc+a^2+b^2+c^2-2ab-2bc+2ac\)

\(=2a^2+2b^2+2c^2-4bc\)

\(=2+2\cdot9+2\cdot1-4\cdot3\cdot\left(-1\right)=22+12=34\)

b: \(B=\left(a+b-a+b\right)\left(a+b+a-b\right)=4ab=4\cdot2\cdot5=40\)

19 tháng 9 2018

a ) 36x2 - ( 3x - 2 )2 

= ( 6x - 3x + 2 ) ( 6x + 3x - 2 )

= ( 3x + 2 ) ( 9x - 2 )

b ) 16.( 4x + 5 )2 - 25. ( 2x + 2 )2

= [ 4.( 4x + 5 ) + 5. ( 2x + 2 ) ] [ 4 .( 4x + 5 ) - 5. ( 2x + 2 ) ]

= ( 16x + 5 + 10x + 10 ) ( 16x + 5 - 10x - 10 )
= ( 26x + 15 ) ( 6x - 5 )

a ) 36x2 - ( 3x - 2 )2

= ( 6x - 3x + 2 ) ( 6x + 3x - 2 )

= ( 3x + 2 ) ( 9x - 2 )

b ) 16.( 4x + 5 )2 - 25. ( 2x + 2 )2

= [ 4.( 4x + 5 ) + 5. ( 2x + 2 ) ] [ 4 .( 4x + 5 ) - 5. ( 2x + 2 ) ]

= ( 16x + 5 + 10x + 10 ) ( 16x + 5 - 10x - 10 )

= ( 26x + 15 ) ( 6x - 5 )

30 tháng 7 2018

b)  \(64x^3+1=\left(4x+1\right)\left(16x^2-4x+1\right)\)\

c) \(x^3y^6z^9-125=\left(xy^2z^3-5\right)\left(x^2y^4z^6+5xy^2z+25\right)\)

d)  \(27x^6-8x^3=x^3\left(27x^3-8\right)=x^3\left(3x-2\right)\left(9x^2+6x+4\right)\)

e)  \(x^6-y^6=\left(x^3-y^3\right)\left(x^3+y^3\right)=\left(x-y\right)\left(x^2+xy+y^2\right)\left(x+y\right)\left(x^2-xy+y^2\right)\)

64x3 + 1

= ( 4x )3  +  1

= ( 4x + 1 ) ( 16x2 - 4x + 1 )

Hằng đẳng thức 6 : A3 + B3

27x6 - 8x3

= ( 3x2)3 + ( 2x )3

= ( 3x + 2x ) ( 9x2 - 6x + 4x2 )

HĐT 6

x6 - y6

= ( x2 )3 - ( y2 )3

= ( x2 - y2 ) ( x4 + x2y2 + y4 )

HĐT 7 : A3 - B3

x3y6z9 + 1

= ( xy2z3)3 + 1

= ( xy2z3 + 1 ) ( x2y4z6 + zy2z3 + 1 )

HĐT 6

26 tháng 8 2018

Bài 1 : Phân tích các đa thức sau thành nhân tử :

a) 8x3 - 64

=(2x)3 + 43

=(2x+4)(4x2 - 8x + 16)

c) 125x3 + 1

=5x3 + 13

=(5x+1)(25x2 +5x+1)

d) 8x3 - 27

=(2x)3 - 33

=(2x - 3)(2x2 + 6x + 9)

e) 1 + 8x6y3

=1 + (2x2y)3

=(1 + 2x2y)(4x4y2 -2x2y + 1)

f) 125x3 + 27y3

=(5x)3 + (3y3)

=(5x + 3y)(25x2 - 15xy + 9y2)

26 tháng 8 2018

Bài 1

a) \(8x^3-64\)

\(=\left(2x\right)^3-4^3\)

\(=\left(2x-4\right)\left(4x^2+8x+16\right)\)

c) \(125x^3+1\)

\(=\left(5x\right)^3+1^3\)

\(=\left(5x+1\right)\left(25x^2-5x+1\right)\)
d) \(8x^3-27\)

\(=\left(2x\right)^3-3^3\)

\(=\left(2x-3\right)\left(4x^2+6x+9\right)\)

e) \(1+8x^6x^3\)

\(=1^3+\left(2x^2y\right)^3\)

\(=\left(1+2x^2y\right)\left(1-2x^2y+4x^4y^2\right)\)

f) \(125x^3+27y^3\)

\(=\left(5x\right)^3+\left(3y\right)^3\)

\(=\left(5x+3y\right)\left(25x^2-15xy+9x^2\right)\)