已知0已知0已知0y=-x^3-x^2+x+1y'=-3x^2-2x+1=0-(3x-1)(x+1)=0x=1/3当x=1/3,y=32/27已知0y=-x^3-x^2+x+1=-x^2(x+1)+x+1=(x+1)(1-x^2)=(1-x)(x+1)^2已知0<x<1 求函数y=-x^3-x^2+x+1的最大值是1
已知0y=-x^3-x^2+x+1y'=-3x^2-2x+1=0-(3x-1)(x+1)=0x=1/3当x=1/3,y=32/27已知0
y=-x^3-x^2+x+1=-x^2(x+1)+x+1=(x+1)(1-x^2)=(1-x)(x+1)^2已知0<x<1 求函数y=-x^3-x^2+x+1的最大值是1