2019-2020
1
10
A B
C D
2
AB
CD
3
A B C D
4 A v t1 B A
0.5v t2 C
AABAC=" 4" 1 Bt1 t2=" 4" 1
CABAC = 2 1 Dt1t2=1
5
A
B
C
D
6 1s 4
4
A
B
C
D
7 AB
A B AB
