AEǡ??????ƽߣ????=????24. ͼڡ??????У
??????ƽBMAEڵMOABϣԵOΪԲģOBijΪ뾶ԲMBCڵGABڵF (1)֤AEΪ??ߣ
(2)????=4????=6ʱ??İ뾶 (3)(2)£߶BGij
??????=60㣬25. ͼƽֱϵУıOABCΪΣCΪ(8,0)
ֱxֱlyxÿ1λȵٶ˶ֱlOABC߷ֱڵM??(MڵNϷ) (1)ABꣻ
(2)??????ΪSֱl˶ʱΪt(0??12)Stĺʽ
(3)(2)£tΪֵʱSSֵ
5ҳ16ҳ
6ҳ16ҳ
𰸺ͽ
1.𰸡A
⣺|?2|Ľ2 ѡA
ݸľֵ෴ɵô𰸣
˾ֵ˸ľֵ෴ǽؼ 2.𰸡C
⣺AԳͼΣĶԳͼΣʴѡ⣻ BԳͼΣĶԳͼΣʴѡ⣻ CԳͼΣҲĶԳͼΣʴѡ⣻ DԳͼΣĶԳͼΣʴѡ⣮ ѡC
ԳͼĶԳͼεĸ⣮
ҪĶԳͼԳͼεĸԳͼεĹؼѰҶԳᣬͼ۵غϣĶԳͼҪѰҶԳģת180Ⱥغϣ 3.𰸡C
⣺52400=5.24104 ѡC
nΪѧıʾʽΪ??10??ʽ1|??|<10ȷnֵʱ
ҪԭaʱСƶ˶λnľֵСƶλͬԭֵ>10ʱnԭľֵ<1ʱnǸ
ѧıʾѧıʾʽΪ??10??ʽ1|??|<10nΪʾʱؼҪȷȷaֵԼnֵ 4.𰸡B
⣺A???2??=???ʴ Bȷ
C??6??2=??4ʴ
D(??+??)2=??2+2????+??2ʴ ѡB
ͬݵijָϲͬϵĸĸָ䣻ͬݵij˷ָӣݵij˷ָˣԸѡų⣮
ͬݵijϲͬͬݵij˷ݵij˷һҪ⣮ 5.𰸡A
??+10
⣺õ{
???10
???1??1 ѡA
ݷʽķĸΪ0żθʽڻ0һʽͬʱʱӦȡĹ֣
˺ԱȡֵΧ⣬жһʽǷ壬ӦǷĸ
7ҳ16ҳ
ĸĸȡֵʹĸΪ㣬θĸȡֵӦʹΪǸ״㣺ѧԶθʽķǸԺͷĸ0 6.𰸡C
⣺????PBǡ??ߣ ???????????????? ??????=??????=90㣬 ֡ߡ??????=2??=130㣬
??=360?(90+90+130)=50㣮 ѡC
PAPBΪԲOߣߵʵõOAֱAPOBֱBPɵóΪֱǣͬԵԲĽǵԲܽǵ2֪??Ķ??????ĶıPABOУıεڽǺͶ??Ķ ҪߵʣıεڽǣԼԲܽǶʼǽⱾĹؼ 7.𰸡A
⣺ݴСΪ1233445555 ݵΪ5 λΪ4 ѡA
λĶ壬ݼжϣ
λ֪ʶĹؼλĶ壮 8.𰸡D
⣺߶εǺΪ360㣬36030=12 ʮΣ ѡD
ݶεǺΪ360㣬ÿǶ30㣬ǵĸȷεı
˶ڽǣؼöεǺΪ360ʣεı
9.𰸡C
⣺??>0ʱ??=?????2ͼһޣ??=????2ĿϣԳyϣ
??<0ʱ??=?????2ͼޣ??=????2Ŀ£ԳyϣCȷ ѡC
??>0??<0ۼɣ
һκκͼϵĹϵǻ֪ʶҪգ 10.𰸡D
⣺????????H ????=????=4???? ????=???? ߡ??=30㣬
8ҳ16ҳ