如图,已知直线AB∥CD,∠C=115°,∠A=25°,则∠E= ;
a2bx3÷a2x=_________;
填空:(1)1010÷______=109; (2)a8÷a4=_____;(3)(-b)9÷(-b)7=________;(4)x7÷_______=1;(5)(y5)4÷y10=_______;(6)(-xy)10÷(-xy)5=_________.
若3n=27,则21-n=______.
当x______时,(3x+2)0=1有意义,若代数式(2x+1)-4无意义,则x=________.
(1)当x_______时,=-2有意义;(2)当x_______时,(x+5)0=1有意义;(3)当x_______时,(x+5)-2=1有意义.