Giúp mình với SOS

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vansang02121998

[tex](-2x^5y^9+\frac{5}{7}x^8y^7z^6-\frac{3}{4}x^4y^2z)(\frac{-1}{2}x^2yz)[/tex]
[tex]x^7y^{10}z-\frac{5}{14}x^{10}y^8z^7+\frac{3}{8}x^6y^3z[/tex]
 
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