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在数学中,有个重要命题:已知 a>0,b>0,如 x=a+b 为定值,那么当 a=b 时,y=a·b 的值最大.
In mathematics, there is an important proposition: we know a>0, b>0, if x=a+b is a fixed value, then when a=b, y=a·b has the largest value.