Học và ôn luyện theo cấu trúc đề thi môn toán phần 2

... 71 n Neu uon theo chieu dai, ta di/gfc hinh tru chieu cao h = 2a\f3 va ban ban kinh day r i = kinh V2 = 29 CHI va duac thi tich V2 = ^ ^ ^ ' ^ (dvtt) 27 1 • n Vi V2 > Vi nen uon theo chieu dai ... le vdi cac so 25 , 12 va 17 SM : M N : NS = 25 : 12 : 17 Tinh the tich khoi chop S.BCC'B' CHI DAN Goi cac canh ciia tam giac SMN la : SM = 25 x, M N = 12x va NS = 17x ta CO : 25 x + 12x + 17x = 54a ... tinh diTgrc x = 2a va duqc cac canh cua tam giac la 18a, 20 a, 34a Ap dung cong thufc S = pr, ta tinh diicfc ban kinh day hinh non r = 4a 26 22 2 V = l ^ K a ^ (dvtt) Mot hinh try c6 thiet dien qua...

... ngoi theo ban a n dai TiTofng txi c a t of v i t r i giufa va N h u vay m o t each sap xep theo ban t r o n tiiOng ufng vdri each s a p xep theo b a n d a i Do so each Hoc va on luyen theo CTDT ... nhdn : Be hoan t h a n h m o t cong viec A p h a i thiic h i e n h a i cong doan Cong doan I CO m each thiic h i e n , cong doan I I c6 n each thiic h i e n t h i c6 m.n each d e hoan t h a n h ... h so thijf t i f la : 1, 2, 3, 4, 5, v a m o t each sap xep theo b a n t r o n n h i i h i n h (1) (2) (3) (4) (5) (6) Neu t a eat b a n t r o n a v i t r i giCfa va r o i t r a i d a i theo...

... Vs _ _ - + V29 X b) Ta lap bang sau : X -00 -4 x'^- Ix^-ll -2{ x^ + 6x + 8) 2| x^ + ex + 8l 2( x2 + x + 8) B i e u thiifc (2) 3x^ + 12x + 15 = 30 -2 -1 2( x^ + Gx + x^ - -x2-12x-17=30 2( x^ + 6x + ... (I) ajX + b i y ^ C j a X + b y = C2 K i hieu D = (1) (2) = aib2 - a2bi goi la d i n h thufc cila he ( I ) b2 - C2 a2 C: b2 C2 b, Ci = Cib2 - - aiC2 - C2bi a2Ci Quy tdc Crame G i a i he phifcfng ... zi ,2 = ± a -2 x =4 - a +2 hoSc a -2 y =4+4 'a + a -2 a +2 a -2 a +2 a -2 a +2 + Vdi - < a < he v6 nghiem 2x 54 G i a i h e p h i / o n g t r i n h : + l y (I) (1) ^ X 2y + - = X y (Trich CHI de thi...

... -1 -90-X 10 0 X + 20-X 11 0 -90-X + 10 0 = « (2) (3) 30-X -1 120 -90-X + 11 0 (90 + x ) b ) x^ - x^ - o + 11 0 12 0 ^ 12 0 -1 -0 ^ = = Oci> X = -90 x^Cx - 1) - ( x - 1) = (x - l ) ( x ^ - 1) = x ' - ... < 10 00 t h i CLi C ^ 20 01! k!(20 01- k)! pk ^ pk +1 ^ pk+2 '-^20 01 - '-^20 01 - ^ 0 (k + l ) ! ( 0 - k ) ! 20 01! ^ ^ plOOO _ p l O O l - ••• - '-'20 01 " '-^20 01 k+ 20 01- k ^ p k *-^20 01 ...