若关于x的方程x的平方加y的平方加4x加6y加13等于O(x,y为实数),则xy等于
若关于x的方程x的平方加y的平方加4x加6y加13等于O(x,y为实数),则xy等于
数学人气:917 ℃时间:2019-11-21 17:38:42
优质解答
x=-2 y=-3 ∴xy=6
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