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29 tháng 9 2018

Ta có:

\(\left(x-1\right)\left(x+2\right)\left(x+3\right)\left(x-6\right)+32x^2\)

\(=\left(x^2-7x+6\right)\left(x^2+5x+6\right)+32x^2\)

Đặt : \(x^2+6=a\left(a< 0\right)\). Khi đó pt trở thành:

\(\left(a-7x\right)\left(a+5x\right)+32x^2\)

\(=a^2-2ax-3x^2=\left(a+x\right)\left(a-3x\right)\)

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

15 tháng 8 2021

1, (x-1)(x+2)(x+3)(x-6)+32x^2

= (x^2 - 7x + 6)(x^2 + 5x + 6) + 32x^2

đặt x^2 - x + 6 = a ta có

(a  - 6x)(a + 6x) + 32x^2

= a^2 - 36x^2 + 32x^2

= a^2 - 4x^2

= (a - 2x)(a + 2x)

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

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

2, (x+1)(x-4)(x+2)(x-8)+4x^2

= (x^2 + 7x - 8)(x^2 - 2x - 8) + 4x^2

đặt x^2 + 2,5x - 8 = a ta có

(a + 4,5x)(a - 4,5x)  + 4x^2 

= a^2 - 81/4x^2 + 4x^2

= a^2 - 65/4x^2

\(=\left(a-\sqrt{\frac{65}{4}}x\right)\left(a+\sqrt{\frac{65}{4}}x\right)=\left(x^2+\frac{5}{2}x-8+\sqrt{\frac{65}{4}}x\right)\left(x^2+\frac{5}{2}x-8-\sqrt{\frac{65}{4}x}\right)\) 

13 tháng 12 2023

\(x^6+y^6=\left(x^2\right)^3+\left(y^2\right)^3=\left(x^2+y^2\right).\left(x^4-x^2y^2+y^4\right)\\ ---\\ 0,04-9x^2=\left(0,2\right)^2-\left(3x\right)^2=\left(0,2-3x\right)\left(0,2+3x\right)\\ ---\\ 32x^2-2\left(y-1\right)^2=2\left[16x^2-\left(y-1\right)^2\right]=2\left[\left(4x\right)^2-\left(y-1\right)^2\right]\\ =2\left(4x-y+1\right)\left(4x+y-1\right)\)

27 tháng 7 2017

Ta có \(x^4+10x^3+32x^2+40x+16=\left(x^4+2x^3\right)+\left(8x^3+16x^2\right)+\left(16x^2+32x\right)+\left(8x+16\right)\)

\(=x^3\left(x+2\right)+8x^2\left(x+2\right)+16x\left(x+2\right)+8\left(x+2\right)\)

\(=\left(x+2\right)\left(x^3+8x^2+16x+8\right)=\left(x+2\right)\left(x+2\right)\left(x^2+6x+4\right)\)

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

19 tháng 6 2016

a)x7+x5+1=x7+x6-x6+2x5-x5+x4-x4+x3-x3+x2-x2+1

=x7-x6+x5-x3+x2+x6-x5+x4-x2+x+x5-x4+x3-x+1

=x2(x5-x4+x3-x+1)+x(x5-x4+x3-x+1)+1(x5-x4+x3-x+1)

=(x2+x+1)(x5-x4+x3-x+1)

b)4x4-32x2+1=4x4+12x3+2x2-12x3-36x2-6x+2x2+6x+1

=2x2(2x2+6x+1)-6x(2x2+6x+1)+1(2x2+6x+1)

=(2x2-6x+1)(2x2+6x+1)

c)x6+27=(x2+3)(x2-3x+3)(x2+3x+3)

d)3(x4+x2+1)-(x2+x+1)

=3x4-3x3+2x2+3x3-3x2+2x+3x2-3x+2

=x2(3x2-3x+2)+x(3x2-3x+2)+1(3x2-3x+2)

=(x2+x+1)(3x2-3x+2)

e)bạn tự làm nhé

12 tháng 10 2021

\(1,\\ a,=4\left(x-2\right)^2+y\left(x-2\right)=\left(4x-8+y\right)\left(x-2\right)\\ b,=3a^2\left(x-y\right)+ab\left(x-y\right)=a\left(3a+b\right)\left(x-y\right)\\ 2,\\ a,=\left(x-y\right)\left[x\left(x-y\right)^2-y-y^2\right]\\ =\left(x-y\right)\left(x^3-2x^2y+xy^2-y-y^2\right)\\ b,=2ax^2\left(x+3\right)+6a\left(x+3\right)\\ =2a\left(x^2+3\right)\left(x+3\right)\\ 3,\\ a,=xy\left(x-y\right)-3\left(x-y\right)=\left(xy-3\right)\left(x-y\right)\\ b,Sửa:3ax^2+3bx^2+ax+bx+5a+5b\\ =3x^2\left(a+b\right)+x\left(a+b\right)+5\left(a+b\right)\\ =\left(3x^2+x+5\right)\left(a+b\right)\\ 4,\\ A=\left(b+3\right)\left(a-b\right)\\ A=\left(1997+3\right)\left(2003-1997\right)=2000\cdot6=12000\\ 5,\\ a,\Leftrightarrow\left(x-2017\right)\left(8x-2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=2017\\x=\dfrac{1}{4}\end{matrix}\right.\\ b,\Leftrightarrow\left(x-1\right)\left(x^2-16\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=4\\x=-4\end{matrix}\right.\)

28 tháng 11 2021
Lol .ngudoots