搞不明白题目意思

theone30

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          答案是D

题目分析是说:147000=147(1000) and 1000=10^3

then 147=3*49,49=7^2所以是2 但是我不明白为什么是每个的几次方相乘才等于147000,为什么7532各自都要有次方,我不知道是哪句或者哪个词没理解对~~所以请教下大家

biglin1987

不是题中说要7532各自都要有次方，是147000分解成质数相乘的形式就是7^2×3×2^3×5^3，是唯一存在的

judymasumi

how many red beads were removed

他有問有多少個紅色被拿出

誠如一樓的大大所說，先做質因數分解後，再看紅色有幾個就是答案了︿︿