菜鸟数学求助

victoria_cc

If M is the least common multiple of 90, 196, and 300, which of the following is NOT a factor of M?

A.    600
B.    700
C.    900
D.    2,100
E.    4,900

victoria_cc

谢谢啦

Rachel夏夕空

选A把。

90=3*2^2*5^2

196=2^2*7^2

300=3*2^2*5^2

所以common multiple is 3^2*2^2*5^2*7^2

而600=2^3*2^2*5^2   其中2需要2^3,比最小公倍数多一个2,所以果断选A.

其余的可以都被涵盖。

haiziqi

菜鸟级，不会做哦。













SIGNATURE:----------------------------------------
An hour in the morning is worth two in the evening
nike free run 3    ,     nike lunareclipse 2    ,    nike free run 2