—Don't listen to music in class again, Mike. —______.
A:No, I don't
B:Don't worry
C:I don't know
D:Sorry, I won't
如图所示,BC是半圆O的直径,AD⊥BC,垂足为D,AB∧=AF∧,BF与AD、AO分别交于点E、G.
(1)证明:∠DAO=∠FBC;
(2)证明:AE=BE.
有50件产品编号从1到50,现在从中抽取5件检验,用系统抽样确定所抽取的编号为( )
已知x2+x﹣2与2x﹣1分别是多项式ax3+bx2+cx﹣5及多项式ax3+bx2+cx﹣2516的因式.求a,b,c.