新GRE數(shù)學平均數(shù)考點解析.

新GRE數(shù)學考試的考點有很多，其中有一個重要考點就是平均數(shù)，為了幫助大家更好的應對新GRE數(shù)學考試，下面澳際教育小編就給大家解析一下新GRE數(shù)學的平均數(shù)考點。 　　本文就平均數(shù)有關(guān)的新GRE數(shù)學考試重點做解析，希望可以幫助大家鞏固基礎，更好地備考新GRE數(shù)學考試。 　　Average of n numbers of arithmetic proGREssion (AP) is the average of the smallest and the largest number of them. The average of m number can also be written as x + d(m-1)/2. 　　Example: 　　The average of all integers from 1 to 5 is (1+5)/2=3 　　The average of all odd numbers from 3 to 3135 is (3+3135)/2=1569 　　The average of all multiples of 7 from 14 to 126 is (14+126)/2=70 　　remember: 　　Make sure no number is missing in the middle. 　　With more numbers, average of an ascending AP increases. 　　With more numbers, average of a descending AP decreases. 　　AP:numbers from sum 　　given the sum s of m numbers of an AP with constant increment d, the numbers in the set can be calculated as follows: 　　the first number x = s/m - d(m-1)/2,and the n-th number is s/m + d(2n-m-1)/2. 　　Example: 　　if the sum of 7 consecutive even numbers is 70, then the first number x = 70/7 - 2(7-1)/2 = 10 - 6 = 4. 　　the last number (n=m=7)is 70/7+2(27-7-1)/2=10+6=16.the set is the even numbers from 4 to 16. 　　Remember: 　　given the first number x, it is easy to calculate other numbers using the formula for n-th number: x+(n-1) 　　AP:numbers from average 　　all m numbers of an AP can be calculated from the average. the first number x = c-d(m-1)/2, and the n-th number is c+d(2n-m-1)/2, where c is the average of m numbers. 　　Example: 　　if the average of 15 consecutive integers is 20, then the first number x=20-1(15-1)/2=20-7=13 and the last number (n=m=15) is 20+1(215-15-1)/2=20+7=27. 　　if the average of 33 consecutive odd numbers is 67, then the first number x=67-2(33-1)/2=67-32=35 and the last number (n=m=33) is 67+2(233-33-1)/2=67+32=99. 　　Remember: 　　sum of the m numbers is cm,where c is the average. 　　以上就是關(guān)于新GRE數(shù)學考試平均數(shù)考點的解析，考生在備考新GRE數(shù)學考試的時候，可以通過本文掌握平均數(shù)這個考點，希望能夠幫助大家更好的應對新GRE數(shù)學考試。 澳際培訓在國內(nèi)首家推出專職"學習規(guī)劃師"和"留學規(guī)劃師"制度，對學生全程規(guī)劃、全程跟蹤，全程反饋。我們匯聚了國內(nèi)外頂級名師，平均教學經(jīng)驗在5年以上，并實行八對一尊享服務--課程規(guī)劃師，留學規(guī)劃師，閱讀教師，寫作教師，聽力教師，口語教師，語法教師，詞匯教師等八位一體。完善的留學服務保證，整合了十年留學服務經(jīng)驗，讓我們能將一流培訓和申請服務全程有機結(jié)合。澳際50%學子都獲得TOEFL 100和SAT 2000以上的分數(shù)。 澳際六步曲第二步考試指導具體服務項目如下： 1. 免費測評?？?，分析申請人的問題，制作考試測評報告和備考指導 2. 結(jié)合申請人的申請目標和考試基礎，制定考試整體規(guī)劃及時間安排 3. 提供對申請人有幫助的考試經(jīng)驗和機經(jīng)等 4. 根據(jù)需要提供免費口語模擬和指導服務 5. 免費修改作文4篇 6. 考前心理指導，調(diào)整考前心理狀態(tài) （注：口語模擬和作文修改服務提供時間為每年2月28日-8月1日）