如图,O是矩形ABCD的对角线AC的中点,M是AD的中点,若AB=5,AD=12,则四边形ABOM的周长为 .
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=_______.
计算:-3a×(-3a)=________.