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数学
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若函数F(X)=1/√ AX^2+4AX+3定义域为R,求实数A的取值范围
人气:441 ℃ 时间:2019-12-09 18:30:54
解答
F(x)=1/√(Ax²+4Ax+3)
因为F(x)的定义域为R
所以Ax²+4Ax+3>0
当A=0时符合题意
当A>0时,△=(4A)²-12A
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