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
|
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
|
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
|
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
|
