‸㜲⸷㔸 R ⸷㔸 㔸O႞⸷ R㜲 R႞⸷R ⸷R⸷ R ⸷R S RY R႞⸷R ‸႞⸷ O ㌠㐰⸷㔸甐⸷R AB = ‸ ႞ 㔸OR SAB ⸷㔸 RO S
5
.âu 123:
‸㜲⸷㔸 R ⸷㔸 㔸o႞⸷ R㜲 R႞⸷R ⸷R⸷ R ⸷R S Ry R႞⸷R ‸႞⸷ O ㌠㐰⸷㔸甐⸷R AB = ‸ ႞ 㔸oR SAB ⸷㔸 Ro S. o ⸷ 甐 R ⸷㔸 q ႞⸷R R႞ R႞⸷R ⸷R⸷ ằ⸷㔸႞A. p
‸B. p ‸ . p ‸ D.
.‸âu 124:
R 甐 R R o ⸷R⸷ ⸷㔸㜲Ro o R႞⸷R RR 㔸oR R R R⸷R ằ⸷㔸 ႞ ႞A. ႞
3
4 p B. ႞
3
3 p . p ႞
3
D. ႞
3
6 p
âu 125:
‸㜲⸷㔸 R ⸷㔸 㔸o႞⸷ R㜲 ႞ 㔸oR ⸷㔸 ABC ⸷㔸 Ro B 㔸RACB 60 · =
0
R⸷RBC = ႞ . KRo q ႞y ႞ 㔸oR ABC q ႞⸷R R⸷R 㔸R ⸷㔸 AB R႞ ႞ ㌠o R႞⸷R ⸷R⸷ ‸႞⸷㜲႞y R o ⸷ 甐 R ⸷㔸 q ႞⸷R ằ⸷㔸႞A. p ႞ B. 3 ႞ p . 4 ႞ p D. p ႞
âu 126:
CR㜲 R႞⸷R ⸷R⸷ ‸႞⸷ 㜲႞y R ㌠㐰⸷㔸 ႞㜲R = 0
R⸷ 甐⸷R Ry ‸=
5 . ỏo㌠㐰⸷㔸 o⸷R R႞ ⸷R R o ằ⸷㔸 ႞㜲 ⸷Roê ?A.
6B.
8. 6 30 D.
5 4âu 127:
CR㜲 R႞⸷R RRS.ABCD
R RyABCD
R႞⸷R ⸷㔸 R⸷Ra
R⸷RSA
⸷㔸 㔸R oRySA = AC.
KRo q ႞y ႞ 㔸oRSAB
q ႞⸷RSA
႞ ⸷Rậ⸷ ㌠o R႞⸷R ⸷R⸷ ‸႞⸷ 㜲႞y. ỏo o ⸷甐 R ⸷㔸 q ႞⸷R R႞ R႞⸷R ⸷R⸷ ‸႞⸷ 㜲႞y ⸷ y ằ⸷㔸 ႞㜲 ⸷Roê ?A. p ႞ 3 B. p
႞. p ႞ D. p ႞
âu 128:
Ro o ⸷ q ႞ ‸႞ R႞ R႞⸷R ⸷R⸷ ႞ 㔸oR ⸷㔸 ⸷ R o ⸷ 甐 R 50 .R 甐 R R o ⸷R⸷ ႞A. 5 3 p ( )
3
B. 50 3 p ( )
3
. 50 3 p ( )
3
D. 350 3 p ( )
3
âu 129:
CR㜲 R႞⸷R RR 㔸oR R R⸷R Ry ằ⸷㔸a
R⸷R ê⸷ R㜲 o Ry 㔸R600. o ⸷ 甐 R 㜲 ⸷ R ⸷ R႞ R႞⸷R ⸷R⸷ ⸷㔸㜲Ro o R႞⸷R RR ႞A. p ႞ B. 4 ႞ p . 6 ႞ p D. 3 ႞ p
âu 130:
‸㜲⸷㔸 R ⸷㔸 㔸o႞⸷ R㜲 ႞ 㔸oR ABC ⸷㔸 Ro A o AB = 3 BC = 5 .KRo q ႞y ႞ 㔸oR ABC ⸷㔸 q ႞⸷R R⸷R 㔸R ⸷㔸 AB R႞ ㌠㐰⸷㔸 㔸 R႞ BCA R㜲 R ⸷RR႞⸷R ⸷R⸷ ‸႞⸷ 㜲႞y R R 甐 R ႞A.
6pB.
48p. 6
3 p D.
5pâu 131:M
R o ‸႞ R R⸷ 甐⸷R Ry႞ 3
Ro ႞㜲႞ 3
. 甐⸷R R 甐 R R o ⸷㔸㜲Roo R o ‸႞A. 8 6 ႞ p
3
B. 6 6 ႞ p
3
. 4 3 ႞ p
3
D. 6 3 ႞ p
3
âu 132:M R႞⸷R ⸷R⸷
o⸷R o ႞ 㔸oR R⸷R ႞ Ro q ႞y q ႞⸷R ㌠㐰⸷㔸 ႞㜲R႞ ႞ 㔸oR R. R 甐 R R o ⸷R⸷ o ⸷ 甐 R 㜲 ⸷ R ⸷ R႞⸷R ⸷R⸷ ⸷ ㌠o ằ⸷㔸႞p 3႞ p
.B. ႞
3
3
p ႞ p
.A. ႞
3
3
3
. ႞
3
p 3 3႞ p
.D. ႞
3
p 3 ႞ p
âu 133:C R႞⸷R ⸷R⸷ 疰 o
R ⸷㔸 o q ႞ ‸႞ R႞ ⸷R ႞ ㌠o Ro o ⸷ ႞㔸oR R⸷R ႞R 甐 R R႞ R o ⸷R⸷ 疰 ằ⸷㔸႞p . ႞
3
p
p D. 4 ႞
3
p B. ႞
3
A. ႞ 3
3