数学好的请进。。。。

黑羽·煵

第一题：

the disapperance of the dinosaurs about 65 million years ago is one of the great mysteries of science. scientists have recently found that mass extinctions of earth's creatures are separated by periods of roughly 26 million years.

a) about when did other mass extinctions occur?

(答案：39million years)

b)suppose the theory is cooect. estimate when the next mass extinction might occur?

请问B怎么回答？
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第二题：

the olympic summer games are held every four years. the first of the modern era were held in 1864

a)beginning with 1896, list what should have been the first six summer olypics years（答案：1896,1900,1904,1908,1911,1913,1919）

b)during one of those years, the summer olypics were cancelled. what year do you think this was? explain your answer(答案：1916,因为是世界大战)

c)you can use the olypic summer games database to check your answers to parts a and b. look at the results for the men's 400-m track event, which has been included in the modern olypics since 1896. what are the years of the first seven games? which year is missing? which year is extra?

请问C怎么回答？

<3 ran

。。。这是那个年级的题目

b) -65+26+26+26=13  after 13million yrs

You didnt give "the olypic summer games database " and "the results for the men's 400-m track event", so we cant answear Qc

黑羽·煵

多謝樓上的QB暸……

df12112

不懂`

生死极端

- -
咱数学不好
英文好烂
顶一下
咱闪~