用10的整数指数幂表示下列各数:100000,0.1,1,0.00001,-0.001.
用小数表示下列各数:
(1)2×10-7;(2)3.14×10-5;(3)7.08×10-3;(4)2.17×10-1.
(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.
判断题(对的打“∨”,错的打“×”)
(1)(-1)0=-10=-1;( ) ;( )
(3)-(-2)-1=-(-2-1);( ) (4)5x-2=.( )
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).