a swimmer is at a point 500m from the closest point on a straight shoreline.she needs to reach a cottage located 1800m down shore from the closest point.if she swims at 4M/s,and walks at 6M/s,how far from the cottage should she come ashore so as to a

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a swimmer is at a point 500m from the closest point on a straight shoreline.she needs to reach a cottage located 1800m down shore from the closest point.if she swims at 4M/s,and walks at 6M/s,how far from the cottage should she come ashore so as to a
a swimmer is at a point 500m from the closest point on a straight shoreline.she needs to reach a cottage located 1800m down shore from the closest point.if she swims at 4M/s,and walks at 6M/s,how far from the cottage should she come ashore so as to arrive at the cottage in the shortest time.

a swimmer is at a point 500m from the closest point on a straight shoreline.she needs to reach a cottage located 1800m down shore from the closest point.if she swims at 4M/s,and walks at 6M/s,how far from the cottage should she come ashore so as to a
这是道几何题吧.一个游泳者距离海岸线最近的点有500m.她要去距离这个最近的点1800m的岸上的一个小屋,如果她的游泳速度是4m/s,步行速度是6m/s,那么如果她要在最短时间内到达小屋需要移动多远的距离?(也就是两点之间直线最短的问题吧)

在不同的路面上有不同的速度， 好比光线穿过两种不同的介质， 只有折射的线路最快， 那么， 如果有一点 符合这个分界点， 就是一个类似折射的问题， 折射率的比值 用在这个上面 希望能帮到

She is a very good swimmer he is a very good swimmer 改为感叹句 Peter is a good swimmer. She is a good swimmer.同义句She ________very ________. He is a good swimmer该同义句 She is a very good swimmer 变为感叹句 He is ____ as any of usA,as good a swimmer;B,as a good swimmer;c,a swimmer as good这是为什么? she is a very good swimmer 同义转换 she does shshe is a very good swimmer 同义转换 He is __ as any of us .A.as good a swimmer B.as a good swimmer C.a swimmer as good D.a good swimmer为什么题目中的as不能解释为像...一样? 1.The boy is good at English(改为同义句) 2.What a good swimmer the boy is!(改为同义句) Amy is a good swimmer.改为同义句 amy is __Amy is a good swimmer.改为同义句 amy is ____ _______ _______ Grace is a very good swimmer .（同义句） Grace is ________ _________ __________. millie is a good swimmer同义句millie is good 同义句谢谢! He is a very good swimmer（同义句） He is ____ _____ ______ Millie is a good swimmer.(改为同一句）Millie is good ____ ____ The swimmer he is talking to a journalist is from England改错,要说原因的额! Millie is a good swimmer,and she can swim___(like)a fish. He is as good a swimmer as any of us 翻译.