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若圆x方+y方=4与圆x方+y方+2ay-6=0(a>0)的公共弦的长为2倍根号3求a
人气:242 ℃ 时间:2020-03-31 10:24:14
解答
x^2+y^2 = 4
x^2+y^2 +2ay -6 = 0
2ay = 2
y = 1/a
x = ±√ (4-1/a^2)
2√ (4-1/a^2) = 2√3
a = ±1
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