ʸԳʵ⼰

ѡ⣨⹲15⣬ÿС2֣30֣

21.ݡƵ취Ĺ涨лƵҪñУ

ABռ
CȲ񱨸DƵ

ο𰸣CD

𰸽ˣռˣΪ15ꣻռ˱Ϊ15ֽ꣨дռ˱Ϊ25꣩Ȳ񱨸ƵᶼΪñܡ̲P92-93.

ģԾѡ֪ʶŶ

22.ݡн˻취Ĺ涨ҵԿн˻У

A˻Bһ˻

Cרô˻Dʱ˻

ο𰸣ABCD

𰸽̲P109ݡн˻취Ĺ涨ҵн˻ࣺ˻һ˻רô˻ʱ˻

ģԾѡ֪ʶϰŶ

23.ݡҵƶȡ涨иУʽУ

AýBͶʿ

CгжһƱDлƱ

ο𰸣BD

𰸽ýͨӦտĿ㣻ͶʿлƱͨʽ𡱿Ŀ㣻гжһƱͨӦƱݡӦƱݡĿ㡣

24.ҵյͶʵֽʱ漰ĻƿĿУ

AͶBͶ

CӦչDд

ο𰸣BCD

𰸽ͶֻڳʱŻ漰Ͷĺ㣬ʱյͶʵֽʱǣ

裺д

ӦչͶ

ͶʵͷֻعijͶʳɱ
25.ҵת̶ʲʱ漰ĻƿĿУ

ABӪҵ

CӪҵ֧Dڴ̯

ο𰸣BC

𰸽ҵת̶ʲʱ漰ĻƿĿУӪҵӪҵ֧

26.ʲծĿУծУ

AԤ˿BӦ

CԤ˿Dһڵڵijڽ

ο𰸣ABD

𰸽Ԥ˿ҵʲԤ˿Ӧҵծһڵڵijڽ޲һ꣬Ҳҵծ

27.ҵɵ˰УӦͨӦĿУ

AƲշBѸ

Cʹ˰DԴ

ο𰸣BD

𰸽ѸԴӦͨӦĿ㡣̲P264

28.ʱĿУֱתʱУ

AײBȨͶ׼

CʱDʱɱ

ο𰸣CD

𰸽ʱʱɱֱۣתʱײȨͶ׼ֱתʱתˡʱʱſתʱ̲P2825-8һСλ

29.ҵڲñַ㻵ʧʱƻʧķУ

AB϶

CٷֱȷDӦտٷֱȷ
ο𰸣ABCD

𰸽ַƻʧķ֣Ӧտٷֱȷٷֱȷ͸϶̲P136ҳһΡ

30.иУӦƷɱУ

AӪҵB

CD

ο𰸣ABC

𰸽ҵڼDzԼƷɱģҪһķɱеġABCDzܼƷɱеġ

31.иУӰӪҵĿУ

AƷɱBԭ

C۹̶ʲDתùƱ

ο𰸣AB

𰸽

AƷɱ롰ӪҵɱӰӪҵ

Bԭ룬롰ҵ롱ӰӪҵ

C۹̶ʲ棬롰Ӫҵ롱ӰӪҵ

DתùƱ棬롰Ͷ桱ӰӪҵ

ԿһеĿ˳Ӫҵļ㶼ʲôĿɵģôֻҪеĿ˱䶯ͻӰӪҵĽ

32.ҵͶ߳ʱлƿĿܷ仯У

Aӯ๫Bʱ

CʵʱD

ο𰸣BC

𰸽Ͷ߳ʱķ¼ǣ

裺дʲĿ

ʵʱ

ʱ

33.иУڻƻְܵУ
AлƺBԤ⾭ǰ

CδҵDʵʩƼල

ο𰸣AD

𰸽ƵĻְлƺʵʩƼල̲P2

34.ҵʵʩ㻯ƣڻʼǰӦõĻУ

Aº˶Ŀֹ

B淶ƾ֤˲ĸʽ

CƿĿϵȷƿĿ

D淶ƾ֤˲ɡݺʹ

ο𰸣ABCD

𰸽̲P99.

35.ҵзУӦõУ

ABҵд

CԴDо뿪

ο𰸣BCD

𰸽ӦüӪҵú㣬Ӧüк㣬̲P322