x^2=-Log2(x)>=0
即Log2(x)我是不是太笨了，看不懂啊那个x^2=-Log2(x)>=0为什么会大于等于0呢？然后-1<=Log2(x)<=0又是为什么呢 ……x^2>=0则有x^2=-Log2(x)>=0然后-1<=Log2(x)<=0Log2(1)>=0Log2(1/2)>=-1