x^2-2007x-2008
Phan tich da thuc thanh nhan tu
giup minh nha
Phan tich da thuc thanh nhan tu:
\(x^4+2008x^2+2007x+2008\)
\(x^4-x+2008x^2+2008x+2008\)
\(=x\left(x^3-1\right)+2008\left(x^2+x+1\right)\)
\(=x\left(x-1\right)\left(x^2+x+1\right)+2008\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+2008\right)\)
Phan tich da thuc thanh nhan tu
a) \(x^2+7x+6\)
b) \(x^4+2008x^2+2007x+2008\)
a, x^2 + 7x + 6
= x^2 + x + 6x + 6
= x(x + 1) + 6(x + 1)
= (x + 6)(x + 1)
\(x^2+7x+6\)
\(=x^2+x+6x+6\)
\(=x\left(x+1\right)+6\left(x+1\right)\)
\(=\left(x+6\right)\left(x+1\right)\)
\(a,x^2+7x+6\)
\(=x^2+x+6x+6\)
\(=x\left(x+1\right)+6\left(x+1\right)\)
\(=\left(x+1\right)\left(x+6\right)\)
\(b,x^4+2008x^2+2007x+2008\)
\(=x^4-x+2008x^2+2008x+2008\)
\(=x\left(x^3-1\right)+2008\left(x^2+x+1\right)\)
\(=x\left(x-1\right)\left(x^2+x+1\right)+2008\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+2008\right)\)
giúp mình nha. phan tich da thuc thanh nhan tu x^4-x^2-56
\(x^4-x^2-56\)
\(=x^4-8x^2+7x^2-56\)
\(=x^2\left(x^2-8\right)+7\left(x^2-8\right)\)
\(=\left(x^2-8\right)\left(x^2+7\right)\)
\(x^4-x^2-56=x^4+7x^2-8x^2-56=x^2\left(x^2+7\right)-8\left(x^2+7\right)\)
\(=\left(x^2+7\right)\left(x^2-8\right)\)
\(x^4-x^2-56\)
\(=x^4+7x^2-8x^2-56\)
\(=x^2\left(x^2+7\right)-8\left(x^2\:+7\right)\)
\(=\left(x^2+7\right)\left(x^2-8\right)\)
~ Rất vui vì giúp đc bn ~
phan tich da thuc thanh nhan tu (xy+1)^2 -(x-y)^2 ai giup minh voi
\(\left(xy+1\right)^2-\left(x-y\right)^2=\left(xy+1+x-y\right)\left(xy+1-x+y\right)\)
\(=x^2y^2+xy-x^2y+xy^2+xy+1-x+y+x^2y+x-x^2+xy-xy^2-y+xy-y^2\)
\(=x^2y^2+2xy-x^2-y^2+1\)
Phan tich da da thuc thanh nhan phan tu
(x^2+x+1)(x^2+x+2)-12
\(=\left(x^2+x\right)^2+3\left(x^2+x\right)+2-12\)
\(=\left(x^2+x\right)^2+3\left(x^2+x\right)-10\)
\(=\left(x^2+x+5\right)\left(x^2+x-2\right)\)
\(=\left(x^2+x+5\right)\left(x+2\right)\left(x-1\right)\)
phan tich da thuc thanh nhan tu
x^2-x-y^2-y
x^2-2xy+y^2-z^2
bai 32 va 33 sbt
lop 8 bai phan tich da thuc thanh nhan tu bang cach nhom hang tu
Ta có
a, x2-x-y2-y
=x2-y2-(x+y)
=(x-y)(x+y) - (x+y)
=(x+y)(x-y-1)
b, x2-2xy+y2-z2
=(x-y)2-z2
=(x-y-z)(x-y+z)
con bai 32, 33 neu ban tra loi duoc minh h them
phan tich da thuc thanh nhan tu (x^2+xy)^2-(y^2+xy)^2
Ai giup minh voi a
x^2 - 2xy + y^2 - z^2 phan tich da thuc thanh nhan tur
\(x^2-2xy+y^2-z^2\\=(x^2-2xy+y^2)-z^2\\=(x-y)^2-z^2\\=(x-y-z)(x-y+z)\)
Phan tich da thuc thanh nhan tu :x^2+7x-15
x^2 + 7x -15
= x^2 + 7x +12,25 -27,25
= (x+3,5)^2 - 27, 25
= ( x+3,5 - \(\sqrt{27,25}\))(x+3,5+\(\sqrt{27,25}\))