- *LYHQ .
||.
.
RRUY
RU YB
UB YB
#
A
Prove: #YUB RBU.
ͼ6HHFigure 8.7ͽ
- Prove: z = xy.
ͼ6HHFigure 8.8ͽ - *LYHQ.
.
GT GO
GA TO
A
Prove: AELVHFWVTO.
ͼ6HHFigure 8.9ͽ
- *LYHQ ||.
||.
BE CD
AC ED
Prove: #ab.
ͼ6HHFigure 8.10ͽ
R
Y
U
B
Figure 8.7
Figure 8.8
x
y
z
G
TA O
Figure 8.9
A
B
C a
b
D
E
Figure 8.10