2014-03-06 15:26
413
3
|a| a
1.
1
1
200 100 60C
40C
2
① 3, 1.5, 1/2, 584 0
② 3 1.5 1/2 , 584
③
+
3
1
① 1
1
②
③ 0
2 1,2,3,0-1,-2,-3.......
3 1/2 ,3 3/4, 0.6, 1/2 , 3 3/4 , 0.6 …..
4
1 2
① a ≥ 0
② a ≤ 0
③ a0, a 0
2.
1
1
2
3
2
1
2 0
3
4 1 2 3……. 1 2 3…….
1
2 1 2 3 5….
2 4 6… 3 6 9 ….
3
0
4
1
2
1
1
4 4
2
2
a a 0 0 a
3
1 + +5 =5 , + 5 = 5
2 3 3
3 =3
1
1 a a
a |a|
(2) 0 0
|a|= a(a0) -a(a0) 0(a=0)
2
1
2
3
3
1 0 0
2
2 1.2 4
