求解

sichuanjay

例3：蓝皮书P210第499题
In a certain game, a large container is filled with red, yellow, green, and blue beads worth, respectively, 7, 5, 3, and 2 points each .A number of beads are then removed from the container. If the product of the point values of the removed beads is 147,000, how many red beads were removed?
(A)5
(B)4
(C)3
(D)2
(E)0

kidsu1991

这道题就是说容器里有红，黄，绿，蓝四种珠子分别对应7，5，3，2。这些珠子呢将从这个容器中移出来。如果这些数值的乘积是147，000，那么红色的珠子被移出了多少个？
简单来说就是这么个式子147000=7^2*3*5^3*2^3，所以呢红色对应的7就移了2个。

kwok1123

我当年把product看成了sum，想了好久没想通