端点或中点坐标 | 端点或中点的函数值 | 取区间 | ||
a0=1,b0=2 | f(1)=-2<0,f(2)=6>0 | (1,2) | ||
x1=
| f(1.5)=0.625>0 | (1,1.5) | ||
x2=
| f(1.25)=-0.984 3 5<0 | (1.25,1.5) | ||
x3 =
| f(1.375)= -0.259 765 625<0 | (1.375,1.5) | ||
x4=
=1.437 5 | f(1.437 5)=0.161 865 234 4>0 | (1.375,1.437 5) |
所以函数f(x)=x3+x2-2x-2精确度为0.1的零点可取为1.375或1.437 5.