1.y‘经过同分,分子部分为 根号(4x+12)-根号(2x+4),在x》=-2情况下,恒大于0,所以在定义域魏增函数,最小值为y(-2)=-1,值域就是【-1,+无穷】
2.这个同理,求导,分子最后有个1-x^2项,根据然后分为3个区间讨论导数正负,画出原函数草图,就能求了
利用导数求值域和最值
利用导数求值域和最值
1.求值域 y=根号(2x+4)-根号(x+3) x>=-2
2.y=2x/(x^2+1) 求最值
1.求值域 y=根号(2x+4)-根号(x+3) x>=-2
2.y=2x/(x^2+1) 求最值
数学人气:809 ℃时间:2020-01-27 08:52:05
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