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ntngocanh1712
2 năm trước
Cho ba đơn thức $\frac{-1}{2012}$$x^{4}$$ y $$z^{3}$; $ 1006 $$x^{3}$$y^{2}$$ z $; $\frac{-2}{3}$$x^{5}$$ y $$z^{4}$, khi $ x $, $ y $, $ z $ $\neq$ $ 0 $. Chứng minh rằng có ít nhất một đơn thức với giá trị dương trong số chúng cùng tất cả các giá trị có thể.
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