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2 tháng 8 2021

\(x^2y+y^2x+x^2z+z^2x+y^2z+z^2y+2xyz\)..

\(=\left(x^2y+z^2y+2xyz\right)+\left(y^2x+y^2z\right)+\left(z^2x+x^2z\right)\).

\(=y\left(x+z\right)^2+y^2\left(x+z\right)+xz\left(x+z\right)\)

\(=\left(xy+yz\right)\left(x+z\right)+\left(x+z\right)\left(y^2+xz\right)\).

\(=\left(x+z\right)\left(xy+yz+y^2+xz\right)\).

\(=\left(x+z\right)\left[x\left(y+z\right)+y\left(y+z\right)\right]\).

\(=\left(x+z\right)\left(x+y\right)\left(y+z\right)\).

9 tháng 8 2016

\(x^2y+xy^2+x^2z+y^2z+2xyz=z\left(x^2+2xy+y^2\right)+xy\left(x+y\right)=z\left(x+y\right)^2+xy\left(x+y\right)=\left(x+y\right)\left[z\left(x+y\right)+xy\right]=\left(x+y\right)\left(zx+zy+xy\right)\)

 x^2y+xy^2+x^2z+xz^2+y^2z+yz^2+2xyz 
=x^2y+xy^2+xyz+x^2z+xz^2+xyz+y^2z+yz^2 
=xy(x+y+z)+zx(x+y+z)+yz(y+z) 
=x(y+z)(x+y+z)+yz(y+z) 
=(y+z)(x^2+xy+zx+yz) 
=(x+y)(y+z)(z+x)

t i c k mk nha!!! 565464556756768768787669789789776575656767676945645645654

7 tháng 10 2019

a,  \(xy\left(x+y\right)+yz\left(y+z\right)+xz\left(x+z\right)+2xyz\)\(=x^2y+xy^2+y^2z+yz^2+x^2z+xz^2+2xyz\)

\(=\left(x^2y+xy^2+xyz\right)+\left(x^2z+xz^2+xyz\right)+\left(y^2z+yz^2\right)\)

\(=xy\left(x+y+z\right)+xz\left(x+z+y\right)+yz\left(y+z\right)\)

\(=x\left(x+y+z\right)\left(y+z\right)+yz\left(y+z\right)\)

\(=\left(y+z\right)\left(x^2+xy+xz+yz\right)\)

\(=\left(y+z\right)\left[x\left(x+z\right)+y\left(x+z\right)\right]\)

\(=\left(y+z\right)\left(x+z\right)\left(x+y\right)\)

b, \(2x^2+2y^2-x^2z+z-y^2z-2\)

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

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

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

9 tháng 8 2015

b)x(y+z)2+y(z+x)2+z(x+y)2-4xyz

=[x(y+z)2-2xyz]+[y(z+x)2-2xyz]+z(x+y)2

=x(y2+2yz+z2-2yz)+y(x2+z2+2xz-2xz)+z(x+y)2

=x(y2+z2)+y(x2+z2)+z(x+y)2

=xy2+xz2+x2y+yz2+(xz+yz)(x+y)

=xy(x+y)+z2(x+y)+(xz+yz)(x+y)

=(x+y)(xy+z2+xz+yz)

=(x+y)[x(y+z)+z(y+z)]

=(x+y)(y+z)(x+z)

9 tháng 8 2015

a)x(y2-z2)+y(z2-x2)+z(x2-y2)

=x(y-z)(y+z)+yz2-x2y+x2z-y2z

=(y-z)(xy+xz)-x2(y-z)-yz(y-z)

=(y-z)(xy+xz-x2-yz)

=(y-z)[x(y-x)-z(y-x)]

=(y-z)(y-x)(x-z)

28 tháng 9 2015

Phân tích đa thức thành nhân tử:(x-y)3 + (y-z)3 + (z-x)3x2y2(y-x)+y2z2(z-y)-z2x2(z-x)x8+x4+19a3-13a+6Phân tích đa thức thành nhân tử bằng phương pháp đồng nhất hệ số:x4-3x3+6x2-5x+3 bấm vào đó đi

nhấn vào đây nhé có 2 cách làm: Chuyên đề Bồi dưỡng học sinh giỏi - Phân tích đa thức thành nhân tử - Giáo Án, Bài Giảng

t i c k mk!! 536546456545576768978045362546115346456575676868784675462552

27 tháng 10 2019

Câu hỏi của Kim Lê Khánh Vy - Toán lớp 8 - Học toán với OnlineMath

14 tháng 8 2020

Ta có :

\(\left(x+y\right)\left(x^2-y^2\right)+\left(y+z\right)\left(y^2-z^2\right)+\left(z+x\right)\left(z^2-x^2\right)\)

\(=\left(x+y\right)^2.\left(x-y\right)+\left(y+z\right).\left(y^2-x^2+x^2-z^2\right)+\left(z+x\right)\left(z^2-x^2\right)\)

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

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

\(=\left(x^2-y^2\right)\left(x+y-y-z\right)-\left(z^2-x^2\right).\left(y+z-z-x\right)\)

\(=\left(x^2-y^2\right).\left(x-z\right)-\left(z^2-x^2\right).\left(y-x\right)\)

\(=\left(x-y\right)\left(x+y\right)\left(x-z\right)+\left(z-x\right)\left(z+x\right)\left(x-y\right)\)

\(=\left(x-y\right).\left[\left(x+y\right)\left(x-z\right)+\left(z-x\right).\left(x+z\right)\right]\)

\(=\left(x-y\right)\left(x^2-zx+xy-yz+zx+z^2-x^2-xz\right)\)

\(=\left(x-y\right)\left(z^2-zx+xy-yz\right)\)

\(=\left(x-y\right)\left[z.\left(z-x\right)-y.\left(z-x\right)\right]\)

\(=\left(x-y\right)\left(z-y\right)\left(z-x\right)\)

\(=\left(x-y\right)\left(y-z\right)\left(x-z\right)\)

14 tháng 8 2020

Ta có :

\(\left(x+y\right)\left(x^2-y^2\right)+\left(y+z\right)\left(y^2-z^2\right)+\left(z+x\right)\left(z^2-x^2\right)\)

\(=\left(x+y\right)^2.\left(x-y\right)+\left(y+z\right).\left(y^2-x^2+x^2-z^2\right)+\left(z+x\right)\left(z^2-x^2\right)\)

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

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

\(=\left(x^2-y^2\right)\left(x+y-y-z\right)-\left(z^2-x^2\right).\left(y+z-z-x\right)\)

\(=\left(x^2-y^2\right).\left(x-z\right)-\left(z^2-x^2\right).\left(y-x\right)\)

\(=\left(x-y\right)\left(x+y\right)\left(x-z\right)+\left(z-x\right)\left(z+x\right)\left(x-y\right)\)

\(=\left(x-y\right).\left[\left(x+y\right)\left(x-z\right)+\left(z-x\right).\left(x+z\right)\right]\)

\(=\left(x-y\right)\left(x^2-zx+xy-yz+zx+z^2-x^2-xz\right)\)

\(=\left(x-y\right)\left(z^2-zx+xy-yz\right)\)

\(=\left(x-y\right)\left[z.\left(z-x\right)-y.\left(z-x\right)\right]\)

\(=\left(x-y\right)\left(z-y\right)\left(z-x\right)\)

\(=\left(x-y\right)\left(y-z\right)\left(x-z\right)\)