Question

學渣

第六跟七求解，謝謝🙏🙏

uno)
B
答案:
13
3
sacoso - asasino
C
ljo-o
設等腰銳角AABC之三角為36、72、72
, sin 18° =
6.
coso
長為
| AD是分角線,若AB =1,則底邊
sino
coso
DADI ~ ADEC
;
tano
21212
472
1818
vs-
1=DL= DLX
I-X
Nitx
Du = x
27
答案:28
18
DADE ~ADCE
-1+5,15-1
答案:
2
1-X: DE DEX
DE = X(1-X)
DE = 5x + X)
72
OL= 5x
B WX
c
D NX
ÃO: 11-X) + x11-X)
- x² - 2X+1 +V-X - 1-X ĀD=VFX
7. 如下圖,AABC 中,∠A=90° , AB = AC = 3u,於邊 AC上取兩點D、E,使
AD = DE = ECHT ZDBE = 0 , Ji tan 0 =.
答案:
Coso sino = +4
Cosa sino =
11
34
cose sino)
B
brosos

三角函數

Answer 1

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NH

如圖