神马作文网考验你们智商的时候到了 一道英文数学题 同时考验你们的英文 和
来源：学生作业帮 编辑：神马作文网作业帮 分类：英语作业 时间：2024/10/08 01:32:19
考验你们智商的时候到了 一道英文数学题 同时考验你们的英文 和
A man launches his boat from point A on a bank of a straight river,1 km wide,and wants to reach point B,1 km downstream on the opposite bank,as quickly as possible.He could row his boat directly across the river to point C and then run to B,or he could row directly to B,or he could row to some point D between B and C and then run to B.If he can row 6 km/h and run 8 km/h,where should he land to reach B as soon as possible?(We assume that the speed of the water is negligible compared to the speed at which the man rows.)
1 km from C
A man launches his boat from point A on a bank of a straight river,1 km wide,and wants to reach point B,1 km downstream on the opposite bank,as quickly as possible.He could row his boat directly across the river to point C and then run to B,or he could row directly to B,or he could row to some point D between B and C and then run to B.If he can row 6 km/h and run 8 km/h,where should he land to reach B as soon as possible?(We assume that the speed of the water is negligible compared to the speed at which the man rows.)
1 km from C
最快是A直接到B,时间 （根号2）/6
楼上的x已经大于1了,所求不再是最小值
再问： 那数学上一般没提到的话 答案取小数点后面几位数呢
楼上的x已经大于1了,所求不再是最小值
再问： 那数学上一般没提到的话 答案取小数点后面几位数呢