[Toán 8] Cần gấp

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vansang02121998

[tex] xy(x+y)+yz(y+z)+xz(x+z)+2xyz [/tex]

[tex] xy(x+y)+y^2z+yz^2+x^2z+xz^2+xyz+xyz [/tex]

[tex] xy(x+y)+(y^2z+xyz)+(x^2z+xyz)+(yz^2+xz^2) [/tex]

[tex] xy(x+y)+yz(x+y)+xz(x+y)+z^2(x+y) [/tex]

[tex] (x+y)(xy+yz+xz+z^2) [/tex]

[tex] (x+y)[(xy+xz)+(yz+z^2)] [/tex]

[tex] (x+y)[x(y+z)+z(y+z)] [/tex]

[tex] (x+y)(y+z)(x+z) [/tex]
 
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