n is an positive integer, 2n=2*4*6*8*(2n-2)*2n, what is the greatest prime factor of (20)+(22)?
A 19
B 23
C 29
D 31
E 37
我读不懂这个题 (20)+(22)这是什么意思啊?
谢谢
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If 500 is the mutiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y,which multiple of 100 is closest to x+y? (1)x小于500 (2)y小于400