3 30
1 1 1
2 2 ab 1=36 2=__________
3 3ABEFBCDE E+B ________
4 4 ab , 1=60, 2=
5 5ABC BC AA
6 6 ab 128 250 ABC___ _
7 7, ABCD, EF AB,CD E,F,EG? BEF, 1=72, 2=____ ___.
8 8 abcab 7cmbc 3cm ac
9 9 ABC AB=12,BC=5,AC=13, BAC
10 10,ADBC,1=78,2=40, ADC= .
3 30
11 11
.1 1 .2 3 .1 3 .2 4
12 12
2 3 4 5
13 13, ABCD
A B180 A D180 A B A C
14 14ABCD
A1 2 B 2 3 C 14 D 3
15 15ADBC B=30 DB ADE DEC
A30 B 60 C 90 D 120
11 12 13 14 15
16
A B
C D
17 abbccd
Aad Bbd Cad Dbc
18
A
B
C
D c A c 3cm A c
3cm
19 120 AO CO BOD
2
A
BC
D
12
34
2
b
a
3
2
11 2 3
6 7
1
3
2
4 5 b
1
2 a
c
4 5
a
b
c
8
G
F
E
D
C
BA
12
9
D
A
C
B
D
C
B
A1
2
10
