Q29:
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be
A. 2
B. 5
C. 6
D. 7
E. 14
答案是E, 可是我算出是C.
请教牛牛?
3150*y=5^2*3^2*2*7*y 要等于某整数的平方,y一定要含有因子2和7。所以答案是E
感谢,原来是看错题了,以为3和逗号后的150是两回事呢.粗心啊.
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