问下面哪个数最小: a. 2^(-5) b. 2^(-7) c. 2^(-9) d. 3*2^(-9) e. 7*2^(-7)
275n=y^2, 问 Y 多少?
Georgenormally go to work from the interstate, but 今天要walkto work. North 走了4m, West继续走了多少多少, 再North走. Whichdistance is the shortest? 第一个N点到最后destination的N点连线, 直角三角形的斜边.