节点

精确解

近似解

绝对误差

−0.25

0.778801

0.772340

6.46078e−3

−0.50

0.606531

0.606421

1.0966e−4

−0.75

0.472367

0.472470

1.03447e−4

0.25

1.28403

1.284076

5.05833e−5

0.50

1.64872

1.648603

1.18271e−4

0.75

2.117

2.117040

3.99834e−5