∵f(x)=ax 2+c(a≠0),∴f(x 0)=∫ 0 1f(x)dx=[
a x 3
3 +cx] 0 1=
a
3 +c.又∵f(x 0)=ax 0 2+c.
∴x 0 2=
1
3 ,∵x 0∈[0,1]∴x 0=
3
3 .