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数学
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解不等式|x²-9|>10x
人气:121 ℃ 时间:2020-03-30 00:12:05
解答
绝对值项恒非负,x0(x²+10x-9)(x²-10x-9)>0[(x+5)²-34][(x-5)²-34]>0(x+5+√34)(x+5-√34)(x-5+√34)(x-5-√34)>0x≥0,x+5+√34>0,x-5+√34>0(x+5-√34)(x-5-√34)>0x>5+√34或x5+√34或0≤x5+√...
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