a) \(4x^2-12x+9=\left(2x\right)^2-2\cdot2x\cdot3+3^2=\left(2x-3\right)^2\)

b) \(4x^2+4x+1=\left(2x\right)^2+2\cdot2x\cdot1+1^2=\left(2x+1\right)^2\)

c) \(1+12x+36x^2=1^2+2\cdot1\cdot6x+\left(6x\right)^2=\left(1+6x\right)^2\)

d) \(9x^2-24xy+16y^2=\left(3x\right)^2-2\cdot3x\cdot4y+\left(4y\right)^2=\left(3x-4y\right)^2\)

e) \(8x^3+1=\left(2x\right)^3+1^3=\left(2x+1\right)\left(4x^2+2x+1\right)\)

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

\(16y^2-4x^2-12x-9=16y^2-\left(2x-3\right)^2\)

\(=\left(4y-2x+3\right)\left(4y+2x-3\right)\)

( 4y + 2x - 3 )

Trả lời:

16y² - 4x² - 12x - 9

= 16y² - ( 4x² + 12x + 9 )

= ( 4y )² -  ( 2x + 3 )²

= ( 4y - 2x - 3 )( 4y + 2x + 3 )

16y² - 4x² - 12x - 9 = 16y² - (4x² + 12x + 9) = 16y² - (2x + 3)² = (4y - 2x - 3)(4y + 2x + 3)

\(16y^2-4x^2-12x-9=16y^2-\left(4x^2+12x+9\right)=\left(4y\right)^2-\left(2x+3\right)^2=\left[4y-\left(2x+3\right)\right]\left[4y+\left(2x+3\right)\right]\)

=16y²  - (4y² + 12x + 9)

=(4y² )-(2y + 3)²

=(4y-2y-3)(4y+2y+3)

mik nha

a) x³ - 4x² + 12x - 27 = (x - 3)(x² + 3x + 9) - 4x(x - 3)

= (x - 3)(x² + 3x + 9 - 4x) = (x - 3)(x² - x + 9)

b) x³ + 2x² + 2x + 1 = (x + 1)(x² - x + 1) + 2x(x + 1)

= (x + 1)(x² - x + 1 + 2x) = (x + 1)(x² + x + 1)

c) y⁴ - 2y³ + 2y - 1 = (y² - 1)(y² + 1) - 2y(y² - 1)

= (y² - 1)(y² + 1 - 2y) = (y - 1)(y + 1)(y - 1)²

= (y + 1)(y - 1)³

Bài 1: 

a: Ta có: \(\left(6x+3\right)-\left(2x-5\right)\left(2x+1\right)\)

\(=\left(2x+1\right)\left(3-2x+5\right)\)

\(=\left(2x+1\right)\left(8-2x\right)\)

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

b) Ta có: \(\left(3x-2\right)\left(4x-3\right)-\left(2-3x\right)\left(x-1\right)-2\left(3x-2\right)\left(x+1\right)\)

\(=\left(3x-2\right)\left(4x-3\right)+\left(3x-2\right)\left(x-1\right)-\left(3x-2\right)\left(2x+2\right)\)

\(=\left(3x-2\right)\left(4x-3+x-1-2x-2\right)\)

\(=\left(3x-2\right)\left(3x-6\right)\)

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

Bài 2: 

a: Ta có: \(\left(a-b\right)\left(a+2b\right)-\left(b-a\right)\left(2a-b\right)-\left(a-b\right)\left(a+3b\right)\)

\(=\left(a-b\right)\left(a+2b\right)+\left(a-b\right)\left(2a-b\right)-\left(a-b\right)\left(a+3b\right)\)

\(=\left(a-b\right)\left(a+2b+2a-b-a-3b\right)\)

\(=\left(a-b\right)\left(2a-4b\right)\)

\(=2\left(a-b\right)\left(a-2b\right)\)

f: Ta có: \(x^2-6xy+9y^2+4x-12y\)

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

\(=\left(x-3y\right)\left(x-3y+4\right)\)

whatterfice

a, \(5y^2-5x^2+6x+6y=5\left(y-x\right)\left(x+y\right)+6\left(x+y\right)\)

\(=\left(x+y\right)\left(5y-5x+6\right)\)

b, \(12x^2+19x+7=12x^2+12x+7x+7\)

\(=12x\left(x+1\right)+7\left(x+1\right)=\left(12x+7\right)\left(x+1\right)\)

5y² - 5x² + 6x + 6y 

= 5(y² - x²) + 6(x + y) 

= 5(y - x)(x + y) + 6(x + y) 

= (x + y)(5y - 5x + 6) 

b) 12x² + 19x + 7 

= 12x² + 12x + 7x + 7 

= 12x(x + 1) + 7(x + 1) 

= (x + 1)(12x + 7) 

\(a,15a^2b^3+5a^3b^2=5a^2b^2\left(3b+a\right)\\ b,x^2-2x+1-y^2=\left(x-1\right)^2-y^2=\left(x-y-1\right)\left(x+y-1\right)\)

a) 15a²b³+5a³b²=5a²b²(3b+a)
b) x²-2x+x-y²=( x²-y²⁾-(2x+x)
                     =(x-y)(x+y)-x(2-1)
                      =(x-y)(x+y)-x3

a) 9x⁴+16y⁶-24x²y³

=(3x²)²-2.3x².4y³+(4y³)²

=(3x²-4y³)²

b) 16x²-24xy+9y²

=(4x)²-2.4x.3y+(3y)²

=(4x-3y)²

c) 36x²-(3x-2)²

=(36x-3x+2)(36x+3x-2)

=(33x+2)(39x-2)

d) 27x³+54x²y+36xy²+8y³

=(3x)³+3.(3x)².2y+3.3x.(2y)²+(2y)³

=(3x+2y)³

e) y⁹-9x²y⁶+27x⁴y³-27x⁶

=(y³)³-3.(y³)².3x²+3.y³.(3x²)²-(3x²)³

=(y³-3x²)³

f) 64x³+1

= (4x)³+1³

=(4x+1)[(4x)²-4x.1+1²]

=(4x+1)(16x²-4x+1)

e) 27x⁶-8x³  *sửa đề*

=(3x²)³-(2x)³

=(3x²-2x)[(3x)²+3x².2x+(2x)²]

=(3x²-2x)(9x²+6x³+4x²)

~~~

a)x²-4y²

=x²-(2y)²

=(x-2y)(x+2y)

b)x³+27y³

=x³+(3y)³

=(x+3y)(x²-3xy+9y²)

c)4x²+12xy+9y²-16

=(2x+3y)²-4²

=(2x+3y-4)(2x+3y+4)

d)9x²-24xy+16y²-64

=(3x-4y)²-8²

=(3x-4y-8)(3x-4y+8)

e)8x³-27y³

=(2x)³-(3y)³

=(2x-3y)(4x²+6xy+9y²)

f)5x³-7x²+10x-14

=5x³+10x-7x²-14

=5x(x²+2)-7(x²+2)

=(5x-7)(x²+2)

tớ nói thật câu nào cũng dễ, 100% dùng hđt, k cần suy nghĩ

hjkjkhjkhujk,hjukgkgy