问答题
设两点边值问题
【正确答案】正确答案：1)-u"(x)+u=f(x)，-u
(4)
(x)+u"(x)=f"(x)
-u
(4)
+u=f+f"．
[u(x
i+1
)-2u(x
i
)+u(x
i-1
)]=u
xx
(x
i
)+
u
x4
(x
i
)+
-u
(4)
+u=f+f"．
[u(x
i+1
)-2u(x
i
)+u(x
i-1
)]=u
xx
(x
i
)+
u
x4
(x
i
)+
【答案解析】