已知x/3=y/4=z/6,(x,y,z≠0),求xy+yz+xz/x²+y²+z²
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已知x/3=y/4=z/6,(x,y,z≠0),求xy+yz+xz/x²+y²+z²已知x/3=y/4=z/6,(x,y,z≠0),求xy+yz+xz/x²+y
已知x/3=y/4=z/6,(x,y,z≠0),求xy+yz+xz/x²+y²+z²
已知x/3=y/4=z/6,(x,y,z≠0),求xy+yz+xz/x²+y²+z²
已知x/3=y/4=z/6,(x,y,z≠0),求xy+yz+xz/x²+y²+z²
设k=x/3=y/4=z/6
∴x=3k,y=4k,z=6k
(xy+yz+xz) / (x²+y²+z²)
=(12k²+24k²+18k²) / (9k²+16k²+36k²)
=54k²/61k²
=54/61
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