出自最新OG-- The product of all the prime numbers less than 20 is closest to which of the following powers of 10?
A 10^9 B 10^8 C10^7 D 10^6 E 10^5
请教大虾prime numbers 何解?整道题目何解?帮忙写出详细步骤啊!感激涕零~~
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prime numbers < 20 is 2, 3, 5, 7, 11, 13, 17, 19
The production of those numbers = 10 * 11 * 13 * 17 * 19 * 21 = 10^6 * 1.1 * 1.3 * 1.7 * 1.9 * 2.1
Now the question is whether 1.1 * 1.3 * 1.7 * 1.9 * 2.1 is greater than 5, if it is greater than 5 then the answer is C, otherwise, the answer is D.
The final answer is C.
我不知道这种解题方法是否是比较简单的方法,请指教
GMAT数学到底难吗??
好象从机经来看并不象很多人说的超级简单啊
谢谢ANDY!我终于明白了 PRODUCT是乘积,PRIME NUMBER是质数,POWER是方~
天呢~其实搞清楚中文意思就不难了。做了一下午的小学几何,晕菜~
以这个速度做下去也不用考了~FRUSTRATED!
对了,计算器可以带进去的吧~
那不得去撞墙啊,那些考满分的大虾都要把自己变成计算器先啊~~~
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