Problem Solving
试题详情
题目：
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?
选项:
A、5
B、4
C、3
D、2
E、0
答案:
D
提问：
我的思路是：设拿出红豆子a个，其余颜色个数依次为b c d
7a+5b＋3c＋2d＝147000
然后不会求
看解析是用乘法 分解因数 不懂为什么用乘法，我感觉是用加法，然而用加法也不会算。
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