GWD 18-19

[jerry7271]

查尋過了沒這題
If x, y, and z are consecutive even positive integers, which of the following could be equal to x + y + z ?
A.141
B.200
C.318
D.391
E.412

答案是C。 就是不會算...可誤

[scujean]

查尋過了沒這題
If x, y, and z are consecutive even positive integers, which of the following could be equal to x + y + z ?
A.141
B.200
C.318
D.391
E.412

答案是C。 就是不會算...可誤

令3個連續偶正整數為(2k-2)(2k)(2k+2),k必為正整數
3個相加→6k
所以這3個數和必為6的倍數

[jerry7271]

懂了，謝謝啊