... Phòng giáo dục vnh tng Trờng THCS VNH TNG Môn: Toán (dành cho đôị tuyển) Thời gian làm bài: 90 phút (Không kể thời gian giao đề) =====*****===== Câu Nội dung trình bày x > 0; x Câu a) ĐK: Rút gọn ... 0,5 điểm x1 + x2 + + x2005 = 0,5 điểm 0,5 điểm Gọi H trung điểm BE Ta có: HK đờng trung bình hthang OEBI Câu HK // OE // BI Mà: OE AB HK BE BKE cân K (1) BEK = KBE Mặt khác ABK = ACK (2) ... a+b 1 M = + + a b a + b 0,5 điểm 1 + + [ (1 a ) + (1 b) + (a + b)] (1 + + 1) a b a + b 1 9 + + MinM = = a = b = a b a + b 2 0,5 điểm Ta có M = Câu áp dụng BĐT Bunhiacôpxki ta có: 0,5...
... phẩm ống CaO , Cu , Al2O3 , Fe , NaOH Cho tác dụng với CO2 CaO + CO2 CaCO3 Cu + CO2 Al2O3 + CO2 Fe + CO2 2NaOH + CO2 Na 2CO3 + H2O Cho tác dụng với dung dòch HCl CaO + 2HCl ... CaCl2 CaCl + Na CO CaCO + 2NaCl 2 b b b CaCl2 + NaHCO3 không phản ứng m1= 100b Thêm (a+b)mol Ca(OH) Ca(OH) + Na CO CaCO + 2NaOH 2 3 b b b Ca(OH) + NaHCO CaCO + NaOH + H O 3 a ... biệt ống nghiệm Bài giải a/ Theo tính tan muối dd muối : BaCl2 , Pb(NO3)2 , MgSO4 , K 2CO3 Vì : - Gốc axit CO3 tạo kết tủa với Ba , Pb , Mg nên dd K 2CO3 - Pb tạo kết tủa với gốc Cl , SO4 nên...
... 264: (Mức 1) Phản ứng biểu diễn nhiệt phân muối Canxi Cacbonat: A 2CaCO3 t 2CaO +CO+ O2 t B 2CaCO3 3CaO +CO2 t0 C CaCO3 CaO +CO2 t0 D 2CaCO3 2Ca +CO2 +O2 Đáp án: C Câu 265: (Mức 1) Lưu huỳnh đioxit ... khí gồm CO2 , CO , SO2 lội qua dung dịch nước vôi (dư), khí thoát : A CO B CO2 C SO2 D CO2 SO2 Đápán : A Câu 46 (mức 1): Sản phẩm phản ứng phân hủy canxicacbonat nhiệt : A CaO CO B CaO CO2 C CaO ... Na2SO4 v Na 2CO3 D NaNO3 v Li 2CO3 Đáp án: A Câu 199 (Mức 2) Nhỏ giọt quỳ tím vào dung dịch KOH, dung dịch có màu xanh, nhỏ từ từ dung dịch HCl dư vào dung dịch có màu xanh thì: A Màu xanh không...
... D 12 sách Bi trc nghim toỏn lp A 99 998 Cõu 39 B 99 990 C 88888 D 99 999 S no cỏc s di õy m xuụi hay quay ngc li gi nguyờn giỏ tr A 606 B Cõu 40 Có 111 C 886 D 6 89 372 sách xếp vào tủ, tủ có ngăn ... 90 B 12 C 20 Ch em nm 15 tui, nm trc tui em bng D 15 tui ch Hi nm em bao nhiờu tui? A tui Cõu 91 A A C tui D tui B 40 s C 41 s D 45 s 98 99 8 D 98 898 S chn lin trc ca s 99 000 l: 99 898 Cõu 93 ... 84 C; 85 C; 86 D; 87 B; 88 A; 89 A; 90 D; 91 C; 92 C; 93 D; 94 A; 95 D; 96 D; 97 A; 98 B; 99 B; 100 A; 101 B; 102 C; 103 A; 104 A; 105 A; 106 B; 107 A; 108 A; 1 09 D; 110 B; 111 A; 112 D; 113 C;...
... married in the summer of 199 9 A They got married with each other in the summer of 199 9 B Their wedding held in the summer of 199 9 C Their wedding took place in the summer of 199 9 D Their wedding was ... married in the summer of 199 9 A They got married with each other in the summer of 199 9 B Their wedding held in the summer of 199 9 C Their wedding took place in the summer of 199 9 D Their wedding was ... day we could speak animals’ language and know when they are unhappy or annoyed C We don’t know when animals are unhappy or annoyed because we don’t know their language D We don’t understand animals...
... sorry I couldn’t come on Saturday,” said David David apologized They can’t make tea with cold water a Tea can’t be made with cold water c Tea with cold water can’t be made b Tea can’t ... morning d a and c 48 She said “ I must wash my hand now” a She said she had to wash her hand now c She said she had to wash her hand then b She said she must wash her hand now d a and b 49 Jane said ... all are correct 55 The weather was very cold We couldn’t go out a The weather was so cold that we couldn’t go out c It was such cold weather that we couldn’t go out b The weather was too cold for...
... phẩm ống CaO , Cu , Al2O3 , Fe , NaOH Cho tác dụng với CO2 CaO + CO2 CaCO3 Cu + CO2 Al2O3 + CO2 Fe + CO2 2NaOH + CO2 Na 2CO3 + H2O Cho tác dụng với dung dòch HCl CaO + 2HCl ... CaCl2 CaCl + Na CO CaCO + 2NaCl 2 b b b CaCl2 + NaHCO3 không phản ứng m1= 100b Thêm (a+b)mol Ca(OH) Ca(OH) + Na CO CaCO + 2NaOH 2 3 b b b Ca(OH) + NaHCO CaCO + NaOH + H O 3 a ... biệt ống nghiệm Bài giải a/ Theo tính tan muối dd muối : BaCl2 , Pb(NO3)2 , MgSO4 , K 2CO3 Vì : - Gốc axit CO3 tạo kết tủa với Ba , Pb , Mg nên dd K 2CO3 - Pb tạo kết tủa với gốc Cl , SO4 nên...
... "Enough" She's not old She can't get married That coat is not warm I can't wear it in winter That chair is not strong We can't stand on that chair Are you very tall? - Can you reach the top shelf.? ... today.We can't go outside I'm not strong I can't lift this box Tom doesn’t have money He can't pay his bills This bed is not wide Two people can't sleep in this bed The water wasn’t clean We can't ... experienced He can't that job 11 I don’t have money I can't lend you some 12 He is hungry He can't eat three sandwiches 13 Peter isn't tired He can't sleep right away 14 This seat isn't wide We can't sit...
... Unless you were me, you couldn’t understand me 32 We are the world We can co - operate one another 33 Unless this man is a driver, he can’t help you move ... 26 Anne doesn’t attend the party because she wants to be alone 27 This department couldn’t be destroyed unless it built carefully 28 Susan agreed ... big secrets 36 Because man is the first person on Earth, he discovers the earth by hands and brain 37 You can’t join the club unless you are sick ...
... => The meal which Tom cooked was delicious Mary likes collecting dolls, and so does her sister (both…and…) => Both marry and her sister like collecting dolls The man is a famous athlete I ... find/hand/in I wondered if has been found in hand 4) It/ be /small, hardback book/ with a blue cover/ call/ "Gallion Reach"/ by H.M Tomlinson it is a small and hard back book with a blue cover ... the front cover Also the book was given me by author whose signature is on 8) I enclose/ cheque for $ 1.50/ cover the cost/ post it back/ me I enclosed cheque for $ 1.50 cover the cost to post...
... conductorsof heat and electricity B Aluminum is a better conductor of heat and electricity than silver, copper and gold C Silver, copper, and gold are better conductors of heat and electricity than aluminum ... of 199 9 A They got married with each other in the summer of 199 9 B Their wedding held in the summer of 199 9 Hocmai.vn – Ngôi trư ng chung c a h c trò Vi t T ng ñài tư v n: 190 0 58-58-12 - Trang ... question B The counsellor gave frank answers to every question C The counsellor gave a frank answer to every question D The counsellor was frank at the way of answering every question 97 They had...
... tủa trắng BaCO3 H2SO4 + BaCO3 Ba SO4 + H2O + CO2 - Lọ tượng CaCl2 - lọ lại có khí bay lên Na 2CO3 , MgCO3 H2SO4 + Na 2CO3 Na2SO4 + H2O + CO2 H2SO4 + MgCO3 MgSO4 + H2O + CO2 - Dùng ... Dùng CO khử oxit tương ứng FeO + CO Fe + CO2 IV Hợp kim sắt Gang Gang hợp kim sắt với cacbon hàm lượng cacbon – 6%, số nguyên tố khác - Gang có hai loại: gang xám gang trắng - Sản xuất: dùng CO ... 16: Có thể thu khí CO2 từ hỗn hợp CO CO2 cách: a) Qùi tím, nung b) Cho hỗn hợp lội qua dung dòch Ca(OH)2, nhiệt phân CaCO3 c) Oxi, CaCO3 d) Không thể thu khí CO2 từ hỗn hợp CO CO2 Câu 17: Có hai...
... boss is constantly criticising her work (FAULT) Dawn’s boss is constantly finding fault with her work 12.Peter is really looking forward to starting his sky-diving course (HARDLY) Peter can hardly ... of moving again 15.My neighbour assumes that he can use my lawnmower whenever he likes (GRANTED) My neighbour takes it for granted that he can use my lawnmower ... to be taken into careful consideration before we decide to buy a new car 4.She believed she was very likely to win the scholarship (CHANCE) She believed she had a chance of winning the scholarship...
... câuchuyện dễ dàng Tuy vậy, bạn thực hành nhiều dạng Sentence Transformation mức trung cấp đến cao cấp, bạn thấy rằng, thi môn Anh văn, tự luận hay trắc nghiệm, phần dễ ăn điểm Đó lí mục mở ra! ... Thread nho nhỏ giúp ích tất thành viên diễn đàn English Time học ngữ mình, đặc biệt bạn học chuyên Anh! ...
... AMN=BMA 2/C/m ∆ANM=∆BCM: Do cung AM=MB =90 o.⇒dây AM=MB MAN=MBA=45o.(∆AMB vuông cân M)⇒MAN=MBC=45o Theo c/mt CMB=AMN⇒ ∆ANM=∆BCM(gcg) 3/C/m EF⊥Ax Do ADMN nt⇒AMN=AND(cùng chắn cung AN) Do MNBC nt⇒BMC=CNB(cùng ... I B O J Q D Hình 53 1/ a/ C/m MPOI thang vuông Vì OI⊥MI; CO IO(gt) CO/ /MI mà MP CO ⇒MP⊥MI⇒MP//OI⇒MPOI thang vuông b/ C/m: P; Q; O thẳng hàng: Do MPOI thang vuông ⇒IMP=1v hay QMP=1v⇒ QP đường ... giác AKJ AKB ta có: DN AN NH AN DN NH = = = ; ⇒ mà JK=KB⇒DN=NH JK AK KB AK JK KB ÐÏ(&(ÐÏ Bài 59: Cho (O) hai đường kính AB; CD vuông góc với Trên OC lấy điểm N; đường thẳng AN cắt đường tròn M Chứng...
... possible in meaning to the original sentence.(2p) Jane can swim further than I can - I can’t swim _ He didn’t go to school because of his illness - Because he ... 25 Jane never says a hard word to Tom because of her love for him - Because Jane Rewrite the following sentences as directed without changing their meaning : ... 11 They cancelled the flight because it was foggy → Because of 12 Because the traffic is heavy, I sometimes come to my office late → Because of ...