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tunghp1998


CHO: [TEX] \frac{bz-cy}{a}= \frac{cx-az}{b}=\frac{ay-bx}{c}[/TEX]
CMR:[TEX] \frac{a}{x}= \frac{b}{y}= \frac{c}{z} [/TEX]
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CMR:[TEX] \frac{a}{x}= \frac{b}{y}= \frac{c}{z} [/TEX]
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