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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 )

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 )

19 tháng 9 2018

1) \(36x^2-\left(3x-2\right)^2\)

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

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

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

2) \(16\left(4x+5\right)^2-25\left(2x+2\right)^2\)

\(=\left[4\left(4x+5\right)\right]^2-\left[5\left(2x+2\right)\right]^2\)

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

\(=\left(16x+20-10x-10\right)\left(16x+20+10x+10\right)\)

\(=\left(6x+10\right)\left(26x+30\right)\)

\(=2\left(3x+5\right)\left(13x+15\right)\)

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

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

\(=\left(-x-4x+5\right)\left(3x+2y+3\right)\)

4) \(\left(x+1\right)^4-\left(x-1\right)^4\)

\(=\left[\left(x+1\right)^2\right]^2-\left[\left(x-1\right)^2\right]^2\)

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

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

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

5) \(16x^2-24xy+9y^2\)

\(=\left(4x\right)^2-2.4x.3y+\left(3y\right)^2\)

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

6) \(64x^3+1=\left(4x\right)^3+1=\left(4x+1\right)\left(16x^2-4x+1\right)\)

7) \(x^3y^5z^9-125=\left(xy^2z^6\right)^3-5^3=\left(xy^2z^6-5\right)\left(x^2y^4z^{12}+5xy^2z^6+25\right)\)

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

Nhiều quá, giải không hết, có sai sót xin bỏ qua

19 tháng 9 2018

toàn lũ copy bạn Nguyễn Chí Thành cả thôi, chỉ có MMS 

15 tháng 7 2018

\(a,36x^2-\left(3x-2\right)^2=\left(6x-3x+2\right)\left(6x+3x-2\right)\)

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

phần b,c,d lm tg tự

\(e,16x^2-24xy+9y^2=\left(4x-3y\right)^2\)

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

7 tháng 10 2019

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) \(1-9x+27x^2-27x^3\)

\(=-\left(27x^3-27x^2+9x-1\right)\)

\(=-\left(3x-1\right)^3\)

7 tháng 10 2019

d) \(x^3+\frac{3}{2}x^2+\frac{3}{4}x+\frac{1}{8}\)

\(=\left(x+\frac{1}{2}\right)^3\)

e) \(27x^3-54x^2y+36xy^2-8y^3\)

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

18 tháng 8 2018

Bài 8:

b. 1+8x6y3 = 13+23(x2)3y3 = 13+(2x2y)3

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

e. 27x3+\(\dfrac{y^3}{8}\)\(=\left(3x\right)^3+\left(\dfrac{y}{2}\right)^3\)

= (3x+\(\dfrac{y}{2}\))(9x2-\(\dfrac{3xy}{2}\)+\(\dfrac{y^2}{4}\))

18 tháng 8 2018

Bài 9:

c. 1- 9x +27x2 -27x3 = 13-3.12.3x+3.(3x)2-(3x)3

= (1-3x)3

d. x3+\(\dfrac{3}{2}x^2\)+\(\dfrac{3}{4}x+\dfrac{1}{8}\) = x3+\(3x^2.\dfrac{1}{2}\)+\(3x.\dfrac{1}{4}+\left(\dfrac{1}{2}\right)^3\)

= (x+\(\dfrac{1}{2}\))3

f. x2 - 2xy +y2 -4m2 +4m.n - n2 = (x2 - 2xy +y2)-((2m)2 -2.2m.n + n2)

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

17 tháng 7 2016

a) (2x+y)3

c)(x2-y2)(x4+x2y2+y4)

d)-x3+9x2-27x+27

<=> -(x3-9x2+27x-27)

<=>-(x-3)3