If x, y ∈ R + and X + 4Y = 1, then the maximum value of X · y is 0______ ． | Math enthusiast | Mathematical art

If x, y ∈ R + and X + 4Y = 1, then the maximum value of X · y is 0______ ．

Xy = 14x · 4Y ≤ 14 (x + 4y2) 2 = 116, if and only if x = 4Y = 12, take the equal sign

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