The radius of a balloon was x. After air letting out, the volume was reduced by 27.1%. If the balloon is always sphere. What's the functional relationship between the radius r after leaking and the original radius x?
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Ar=0.5x
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Br=0.6x
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Cr=0.7x
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Dr=0.8x
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Er=0.9x
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正确答案: E