已知方程ax'+4x-1=0 当a取什么值,方程有俩个不相等,相等,没有的实数根,'这个符号是平
人气:368 ℃ 时间:2019-10-19 19:29:13
解答
△=4'+4a=16+4a
当△>0时,a>-4两不同根
当△=0时,a=-4两相同根
当△
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