已知x2n=4,求(x3n)2-xn的值.(其中x为正数,n为正整数)
∵x2n=4,x为正数,n为正整数,
∴xn=2,
∴(x3n)2-xn=(xn)6-xn=26-2=62.
已知直线a∥b∥c,且a与b之间距离为6cm,b与c之间距离为10cm,则a与c之间距离为 ______cm.
I won't go to the concert because I _____ my ticket. [ ]
A. lost
B. don't lose
C. have lost
D. will lose