1. =________, =_________.
2. =___________________________, .
3. .
4. =___________________
=_______________________________.
5. =_________________,
=_____________________________.
6.若 , =_____________________, =_______________________.
7.若 ,则n=______________________________.
8.如果(9 ) =3 ,则n的值是______________________________.
9.计算(-4×10 ) ×(-2×10 ) ______________________________.