1.计算:
(1)
2.72.72.7 (2)
16361
(3)
2735 (4)
11222293
2.填空;
1.
x7,则x______;
x7,则x______
2.
5______;
21______2.31____________3;;.
3.
3.7______;
0______;
3.3______;
0.75______.
4.
152__________________343;;.
5.
105______;
63______;
6.55.5______.
6616.-|-7|=_______,-(-7)=_______,-|+3|=_______,
1-(+3)=_______,1+|-(2)|1=_______,+(-2)=_______.
7._______的倒数是它本身,_______的绝对值是它本身.
8. 如果a3,则a3______,3a______
9. 如果a3,则
a______,
a______
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