已知x=2是关于x的方程2x-a =1的解,则a = .
(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.
计算:(1)-0.10=________; (2)(-0.1)0=_______;(3)(-0.5)-2=_______; (4)(-)-1=________.
a0=______(a≠0);a-p=_______(a≠0,p是正整数).
代数式的意义为___________.
计算:(1)199.92=_______;(2)512=________;(3)1-2×51+512=_______.