96.
If x and y are integers greater than 1, is x a multiple of y ?
(1) 3y2 + 7y = x
(2) x2 – x is a multiple of y
这道题目什么意思啊?哪位帮我讲一下哦?
a multiple of ,谁是谁的倍数啊?
问x是否为y的倍数,
1.x=3y^2+7y=y(3y+7),则x肯定是y的倍数。 OK
2.x^2-x=x(x-1)是y的倍数,x不一定是y的倍数,比如x=5,y=20
所以答案是A
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