有一道英数题,two places x and y are 100 kilometers apart.three people a ,b and c leave x at the same time for y.A drives with C at 25kilometers per hour .B walks at 5 kilometers per hour.after a period of time.C gets off A's car and walks at 5

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有一道英数题,two places x and y are 100 kilometers apart.three people a ,b and c leave x at the same time for y.A drives with C at 25kilometers per hour .B walks at 5 kilometers per hour.after a period of time.C gets off A's car and walks at 5
有一道英数题,
two places x and y are 100 kilometers apart.three people a ,b and c leave x at the same time for y.A drives with C at 25kilometers per hour .B walks at 5 kilometers per hour.after a period of time.C gets off A's car and walks at 5 kilometers per hour while A drives back to get B and then they travel together in the cat to go to y.finally,the three people get to y at the same time.How long does it take them to get to Y from X

有一道英数题,two places x and y are 100 kilometers apart.three people a ,b and c leave x at the same time for y.A drives with C at 25kilometers per hour .B walks at 5 kilometers per hour.after a period of time.C gets off A's car and walks at 5
两地xy距离100km
3人abc从x同时出发向y
ac开车,25km/h
b走路5km/h
c在中途某地下车,然后步行5km/h
此时a往回开指导遇到b,然后一起乘车
三人同时到达
求从x-y所花时间
分三时段t1t2t3
第一阶段B走路ac乘车,时间t1
第二阶段B走路a乘车往回,c走路,时间t2
第三阶段ab乘车,c走路,时间t3
所以b行程=5t1+5t2+25t3=xy距离
a行程=25t1-25t2+25t3=xy距离
c=25t1+5t2+5t3=xy距离
所以20t1=20t3；t1=t3
30t1+5t2=xy=50t1-25t2
t2=2/3t1；t1=1.5t2
所以xy=50t2=100,t2=2；
t=t1+t2+t3=8小时

有一道英数题,two places x and y are 100 kilometers apart.three people a ,b and c leave x at the same time for y.A drives with C at 25kilometers per hour .B walks at 5 kilometers per hour.after a period of time.C gets off A's car and walks at 5 一道数学函数题 英语哒 求解答TATThe supply, S(x),and demand, D(x),functions for a product have units of dollars where x is in thousand of items.Use your calculator to find the equilibrium point.Round your answers to two decimal places.equ one can not be in two places at 三角函数最大值和最小值,Find the maximum and minimum values of the function.(Round your answer to two decimal places.) （cos x）/（5+sinx） the most famous of two places.有没有这种表达的?最著名的两个地方应该怎么表达呢?有哪些表达 100分求一道数学题,How quickly will money double if it is invested at a rate of 8 percent compounded continuously?Round your answer to two decimal places.66年,求解释下为什么 三角函数最大值和最小值Find the maximum and minimum values of the function.(Round your answers to two decimal places）y = 8x - 3sin 4x,x在0-2pi之间!急 三角函数最大值和最小值,Find the maximum and minimum values of the function.(Round your answer to two decimal places.)y=（cos x ）/（5+sin x） 三角函数最大值和最小值,帮下忙~Find the maximum and minimum values of the function.(Round your answers to two decimal places）y=（cos 3x）/（4+sin 3x）,求y的最大值和最小值 Joe said that they had got two first places in the sports meeting变为直接引语 英语翻译the total amount to be rounded to two decimal places. places of interests和places of interest有什么区别?就是后面接interest,还是interests? 是famous places of interests还是famous places of interest有什么区别?（详细说明） visit different interesting places和visit different places of interesting 有区别吗 visit different interesting places和visit different places of interesting 有区别吗 PLACES什么意思?PLACES中文是什么意思?有知道的吗!请告诉我!谢谢 place of interest 和 places of interest 有什么区别? 改错：1.Which is better of the two places?2.Shanghai is bigger than any other cities in China.