函数y=(mx^2+4x+m+2)^-1/4+(x^2-mx+1)的定义域是全体实数,则实数m的取值范围是
人气:250 ℃ 时间:2019-08-20 20:15:09
解答
本题的关键是mx^2+4x+m+2对所有的实数x都恒大于0
显然m大于0
另有16-4m(m+2)<0
解得m>(根下5)-1
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