求助OG12的PS第217题

whitezt · 发表于 2010-2-5 15:59:24

数学丢了N年，这道题的解释没看明白。向大伙儿请教，多谢！

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

cristina2 · 发表于 2010-2-5 16:11:22

147000=2*2*3*5*5*7*7

红珠对应7点

上面的分解因式包含两个7

所以答案是红珠2颗选D 请牛人确认

whitezt · 发表于 2010-2-5 16:24:57

明白了，多谢！其实回头想想蛮简单的，丢脸！

求助OG12的PS第217题

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