GWD23-35

[pimi]

Q35 What is the greatest common factor of the positive integers j and k?
(1)k=j+1
(2)jk is divisible by 5


Ans:A

請問如何解出????

[vantreal]

求最大公因數:

(1) k=j+1
j和(j+1)的話, 那最大公因數是1
ex) 2, 3; 99, 100; 134, 135

(2)jk is divisible by 5
ex) jk=1000,
j=2, k=500 -----------最大公因數=2
j=10, k=100 ----------最大公因數=10

Ans: (A)