x********e 发帖数: 1089 | 1 the sum of the first 50 positive even integers is 2550, what is the sum of
the even integers from 102 to 200 , inclusive?
A 5100
B 7550
C 10100
D 15500
E 20100 |
p*******o 发帖数: 6791 | 2 b. 7550
因为 102-100=2
104-100=4
106-100=6
....
所以 102加到200就 2加到100再加上50×100,所以就是2550+5000=7550 |
d********l 发帖数: 4221 | 3 2550+ 50*100 = 7550
the sum of the first 50 positive even integers is 2550, what is the sum of
the even integers from 102 to 200 , inclusive?
A 5100
B 7550
C 10100
D 15500
E 20100
【在 x********e 的大作中提到】 : the sum of the first 50 positive even integers is 2550, what is the sum of : the even integers from 102 to 200 , inclusive? : A 5100 : B 7550 : C 10100 : D 15500 : E 20100
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n***y 发帖数: 15001 | 4 save..
【在 p*******o 的大作中提到】 : b. 7550 : 因为 102-100=2 : 104-100=4 : 106-100=6 : .... : 所以 102加到200就 2加到100再加上50×100,所以就是2550+5000=7550
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x********e 发帖数: 1089 | |
i*****d 发帖数: 603 | |
Z**k 发帖数: 76 | 7 弱,实在是弱。。
【在 x********e 的大作中提到】 : the sum of the first 50 positive even integers is 2550, what is the sum of : the even integers from 102 to 200 , inclusive? : A 5100 : B 7550 : C 10100 : D 15500 : E 20100
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l**********c 发帖数: 434 | 8 小朋友也上网?不用条件,也可以
302*25
【在 x********e 的大作中提到】 : the sum of the first 50 positive even integers is 2550, what is the sum of : the even integers from 102 to 200 , inclusive? : A 5100 : B 7550 : C 10100 : D 15500 : E 20100
|