草原上有4口油井，位于四边形ABCD的4个顶点，现在要建立一个维修

【名词&注释】

四边形(quadrilateral)、维修站(maintenance point)

[填空题]草原上有4口油井，位于四边形ABCD的4个顶点，现在要建立一个维修站H，试问H建在何处，才能使它到4口油井的距离之和AH+HB+HC+HD为最小，说明理由.

查看答案&解析查看所有试题

学习资料：

[单选题]There ____________ an interesting cartoon on CCTV- 6 at seven thirty this evening.

A. is going to have
B. is going to be
C. will have
D. will to be

[单选题]17．

A. shining
B. falling
C. running
D. drying

[单选题]3． The apples are _______the tree， and the birds(鸟) are ______ the tree．

A. in ;on
B. on ;in
C. on ;on
D. in ;in

本文链接：https://www.51ksbd.net/show/x85o3x.html