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答案：
A
值要小于1
可以带入例子
比如r=1/2 s=3/2
那第一个：就是1/3 正确
第二个：3/4 但是第二个要是等于：9/10乘以3/2=2.7了 所以大于1了 不行
第三个：等于1 了 不行 
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