一道Gmat数学题!For any positive integer n,the sum of the first n
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一道Gmat数学题!
For any positive integer n,the sum of the first n positive integers equals n(n+1)/2.what is the sum of all the even integers between 99 and 301?
For any positive integer n,the sum of the first n positive integers equals n(n+1)/2.what is the sum of all the even integers between 99 and 301?
1~99的和为99*(99+1)/2=4950
1~301的和为301*(301+1)/2=45451
100~301的和为45451-4950=40501
100~301 设偶数和为x 则奇数和为x+101 (共202个数,奇数和偶数各101个 奇数和比偶数和大101)
x+(x+101)=40501
x=20200
即偶数和为20200
希望能帮到你!满意请采纳^_^
1~301的和为301*(301+1)/2=45451
100~301的和为45451-4950=40501
100~301 设偶数和为x 则奇数和为x+101 (共202个数,奇数和偶数各101个 奇数和比偶数和大101)
x+(x+101)=40501
x=20200
即偶数和为20200
希望能帮到你!满意请采纳^_^
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