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x/3=y/4=z/6求(xy+yz+xz)/x2+y2+z2=?
人气:180 ℃ 时间:2020-04-06 14:42:02
解答
设x/3=y/4=z/6=t x=3t,y=4t,z=6t (xy+yz+xz)/x2+y2+z2=(12t+24t+18t)/(9t+16t+36t)=54/61
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