已知x/2=y/3=z/4,求xy+yz+zx/5x的方+3y的方+z的方
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已知x/2=y/3=z/4,求xy+yz+zx/5x的方+3y的方+z的方
已知x/2=y/3=z/4,求xy+yz+zx/5x的方+3y的方+z的方
已知x/2=y/3=z/4,求xy+yz+zx/5x的方+3y的方+z的方
设x/2=y/3=z/4=k
则
x=2k
y=3k
z=4k
则
xy+yz+zx/5x的方+3y的方+z的方
=(6k²+12k²+8k²)/(20k²+27k²+16k²)
=26k²/63k²
=26/63