phan tích dt thành nhân tử

T

tiendat102

Câu 2:
[TEX]xy(x+y)+yz(y+z)+xz(x+z)+3xyz[/TEX]
[TEX]=x^2y+xy^{2}+y^2z+yz^2+x^2z+z^2x+3xyz[/TEX]
[TEX]=x^2y+xy^2+xyz+y^2z+yz^2+xyz+x^2z+z^2x+xyz[/TEX]
[TEX]=xy(x+y+z)+yz(x+y+z)+xz(x+y+z)[/TEX]
[TEX]=(x+y+z)(xy+yz+xz)[/TEX]
 
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