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请问下，比较简单的实现 0.5 到 2 之间的随机数的方法
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程序员 - @ukipoi - 要求就是 扩大一倍或者缩小一倍，两边的概率相同。</br></br>这个可以用 Math.radom()，仅以数学的方式，一行就完成吗？</br></br>我好像只能先随机出是扩大还是
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