Mathematics
Senior High
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(1)
2x=
(4)
B
65°
E
50°
O
9
BC=BD
Ly=
A
180-30
=130
(2)
新教p 56, 57 >
Zx=
(5)
B
25°
150%
Zx=\
<y=
50°
D
(3)
220°
Lx=
(6) [余力問題]
2x=
Ly=
40%
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