Is \(\dfrac{x}{m}\cdot (m^2+n^2+k^2)=xm+yn+zk?\)

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Is \(\dfrac{x}{m}\cdot (m^2+n^2+k^2)=xm+yn+zk?\)

(1) \(\dfrac{z}{k}=\dfrac{x}{m}\)

(2) \(\dfrac{x}{m}=\dfrac{y}{n}\)

Answer: C

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