... = a S Diện tích: SABC = BA.BC = 6a2 Thể tích: VS.ABC = SABC.SH = 2a 3 K H Hạ HD ⊥ AC (D ∈ AC), HK ⊥ SD (K ∈ SD) B C ⇒ HK ⊥ (SAC) ⇒ HK = d( H, (SAC)) D BH = SB.cos SBC = 3a ⇒ BC = 4HC ⇒ d( B, (SAC)) ... BC = 4HC ⇒ d( B, (SAC)) = 4 .d( H, (SAC)) A HC 3a Ta có AC = BA2 + BC = 5a; HC = BC – BH = a ⇒ HD = BA = AC SH HD 3a 6a Vậy, d( B, (SAC)) = 4.HK = HK = = 2 14 SH + HD ⎧( x − x)(2 x − y )...
... (SAB) (SAC) vuông góc với (ABC) ⇒ SA ⊥ (ABC) S AB ⊥ BC ⇒ SB ⊥ BC ⇒ SBA góc (SBC) (ABC) ⇒ SBA = 60o ⇒ SA = AB tan SBA = 2a Mặt phẳng qua SM song song với BC, cắt AC N H ⇒ MN //BC N trung điểm AC ... VII .a Gọi z = a + bi (a, b ∈ R), ta có: z = z + z ⇔ (a + bi)2 = a2 + b2 + a – bi (1,0 điểm) 2 a − b = a + b + a ⇔ a – b + 2abi = a + b + a – bi ⇔ ⎨ a = − 2b ⎩b( 2a + 1) = ⇔ ⎨...
... told us A The team leader reminded us to tidy up the final draft before submission B The team leader asked us to tidy up the final draft before submission C The team leader ordered us to tidy ... kidnappers pledged to kill our boy if we did not pay the ransom B The kidnappers threatened to kill our boy if we refused to pay the ransom C The kidnappers ordered to kill our boy if we did ... pass...
... team leader told us A The team leader ordered us to tidy up the final draft before submission B The team leader reminded us to tidy up the final draft before submission C The team leader asked us ... separated B marked C hidden D shared Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions Question 21: Hardl...
... leader told us A The team leader simply wanted us to tidy up the final draft before submission B The team leader ordered us to tidy up the final draft before submission C The team leader asked ... my friend said to me A I was asked to invest more money in my friend’s company B My friend persuaded me to invest more money in his company Trang 2/7 - Mã đề thi 473 C My friend instructed me...
... have cooked so many dishes There are only three of us for lunch.” A oughtn’t B wouldn’t C needn’t D couldn’t Question 47: Our boss would rather during the working hours A we didn’t chat B ... word in common use with complex meanings, and is derived, like the term broadcasting, from the treatment and care of the soil and of what grows on it It is directly related to cultivation and ... Yet t...
... wanted us to tidy up the final draft before submission C The team leader reminded us to tidy up the final draft before submission D The team leader ordered us to tidy up the final draft before ... refused to pay the ransom D The kidnappers pledged to kill our boy if we did not pay the ransom Question 77: “Mum, please don’t tell dad about my mistake,” the boy said A The boy requested his ....
... the unemployed because he graduated with a good degree C If Mike graduated with a good degree, he would join the ranks of the unemployed D That Mike graduated with a good degree helped him join ... have been C direction C coming about C under D packs D Meanwhile D adapt D with D set D vaguely D had been D signal D giving up D in Trang 5/7 - Mã đề thi 951 Mark the let...
... vµ 0.25 mp(ABCD) Hay gãc SHI = 600 ( AB + CD ) AD = 3a 2 * Tam gi¸c IBC cã diƯn tÝch S IBC = S d − S IAB − S ICD = 3a 3a Suy ra: IH BC = S IBC ⇔ IH = v× víi trung ®iĨm M c a AB th× tam gi¸c MBC ... (C) hai điểm phân biệt A, B lµ d ( I ,∆ ) < (1) * Kẻ đường cao IH ∆IAB, ta có: S∆ABC = · · IA.IB.sin AIB = sin AIB 0.25 1.00 2.00 1.00 0.25 0.25 · Do S∆ABC lớn sin AIB = ⇔ ∆AIB vng I * Ta ®ỵc...
... = a S Diện tích: SABC = BA.BC = 6a2 Thể tích: VS.ABC = SABC.SH = 2a 3 K H Hạ HD ⊥ AC (D ∈ AC), HK ⊥ SD (K ∈ SD) B C ⇒ HK ⊥ (SAC) ⇒ HK = d( H, (SAC)) D BH = SB.cos SBC = 3a ⇒ BC = 4HC ⇒ d( B, (SAC)) ... BC = 4HC ⇒ d( B, (SAC)) = 4 .d( H, (SAC)) A HC 3a Ta có AC = BA2 + BC = 5a; HC = BC – BH = a ⇒ HD = BA = AC SH HD 3a 6a = Vậy, d( B, (SAC)) = 4.HK = HK = 2 14 SH + HD ⎧( x − x)(2 x − y )...
... nư c 0,5 - Đoạn thơ thể rõ nét phong c ch nghệ thuật đ c s c Nguyễn Khoa Điềm Lưu ý chung: Thí sinh làm theo c ch kh c nhau, phải đảm bảo yêu c u kiến th c Trên ý thí sinh c n đáp ứng; vi c cho ... thơ trẻ năm kháng chiến chống Mĩ; thơ ông giàu chất suy tư, c m x c lắng đọng, thể tâm tư người trí th c tham gia tích c c vào chiến đấu nhân dân - Đất Nư c thu c phần đầu...