1个回答
展开全部
f(x) = (x-1)^2.(x+1)^3
f'(x) =2(x-1).(x+1)^3 +3(x-1)^2.(x+1)^2
f'(x) =0
2(x-1).(x+1)^3 +3(x-1)^2.(x+1)^2 =0
(x-1).(x+1)^2 .[ 2(x+1) +3(x-1)] =0
(x-1).(x+1)^2 .(5x-1) =0
x=1 or -1 or 1/5
f''(x)
=(x+1)^2 .(5x-1) +2(x-1).(x+1) .(5x-1) + 5(x-1).(x+1)^2
f''(1) = 16 >0 (min)
f''(-1) =0
f''(1/5) =5(-4/5)(6/5)^2 <0 (max)
max f(x) = f(1/5) = (1/5-1)^2.(1/5+1)^3 = 3456/3125
min f(x) = f(1) = 0
ans :B
f'(x) =2(x-1).(x+1)^3 +3(x-1)^2.(x+1)^2
f'(x) =0
2(x-1).(x+1)^3 +3(x-1)^2.(x+1)^2 =0
(x-1).(x+1)^2 .[ 2(x+1) +3(x-1)] =0
(x-1).(x+1)^2 .(5x-1) =0
x=1 or -1 or 1/5
f''(x)
=(x+1)^2 .(5x-1) +2(x-1).(x+1) .(5x-1) + 5(x-1).(x+1)^2
f''(1) = 16 >0 (min)
f''(-1) =0
f''(1/5) =5(-4/5)(6/5)^2 <0 (max)
max f(x) = f(1/5) = (1/5-1)^2.(1/5+1)^3 = 3456/3125
min f(x) = f(1) = 0
ans :B
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
11111
2024-12-18 广告
2024-12-18 广告
作业指导书是一种专门编写的指导性文件,用于完成某一项或同一类型的工作。它是根据设计图纸、制造厂说明书、相关的验评标准、编写人员现场所积累的施工经验以及成熟实用的施工工艺所编写的。定义和作用作业指导书是质量管理体系文件的组成部分,主要用于阐明...
点击进入详情页
本回答由11111提供
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询