Đề học sinh giỏi huyện Toán 6 năm 2018 – 2019 phòng GD&ĐT Nậm Nhùn – Lai Châu

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PHONG GD&DT NAM NHI]N DE THI CHQN HOC SINH GIOI CAP HUYEN Nim hgc 20t8-2019 DE THI CHiNH THUC (Di thi gim 0ltrans) M6n thi: Torln 6 Ngdy thi: 1310112019 Thoi gian.ldm bdi: 150 phrit (Kh6ng k€ thdi gian phdt d€) DA bni CAu 1: (4,0 tli6m). Thuc hi6n phdp tinh a) 155.155 - 155.41 b) 114 2to .s5 + 210.26 28.27 c) 134- {150:50+ [120: 4+25-(12+ l8)]] d) 100: {2s0: [450-( 4.53 -22.2s)]\ CAu 2: (4,0 tli6m). Tim x, bi5t a) zs<s' <tzs b) 7.7 **1 :343 c) l2x- sl= t3 d) 11- s6 tu nhi6n x lon nh6t sao cho 198 + x vit270 -x ddu chia h6t cho x. CAu 3: ( 4,0 tli6m). So srinh a) 1255 vit251 b) 2'm vd 10248 c) 222333 vit333222 d) 32" vd 23'(voi n e N-) CAu 4: (6,0 tti6m). Cho doan theng OC = 9cm vd di,5m A nim gi&a 2 di6m O vd C sao cho OA = 6cm. a) Gpi B Ii trung di€m cria OA, rinh dQ ddi do4n th6ng BC. b) Chtmg t6 rihg A ld trung di6m cta doan thing BC. c) Goi I Ii trung di6m cria doan thing OC. H6i I c6 ld trung di6m cta doan thing AB kh6ng? Vi sao? CAu5: (2,0tli6m).Tinht6ngd6ys6sau: A= l+ 7 +72 +73 + ...+72,',,, ---------u6t-----_ (Thi sinh kh6ng duoc si'd4ng tdi liQu, Gidm thi coi thi kh6ng giai thich gi theml U1 h."--AL-.' PHONG GD&DT NAM NHUN noc oB ruI cnixn rnrlc xi rur cHeN Hec srNH Gror cAr uuvpN Nim hgc 2018-2019 M6n thi: Torln 6 Ciu Y Hufn g din ch6m Di6m 1 (4,0d) a 155.155-155.41 l14 155(155 - 41) tt4 155.114 114 = 155 0,5 0,2s 0,25 b 2".55 + 2t0.26 28.27 _2'o(55 + 26) ^8.1 210.81 n8 rl 2.3 210.34 a8 r] ^/. .3 -22.3 -12 0,25 0,25 0,2s 0,25 134- {150 : 50 + [120 :4 + 25 - (12 + 18)]] :r34 -[3 + (30 +25 - 30)] :134 - (3 +25) :t34-28 : 106 0,25 0,25 0,25 0,25 d 100 : {250: [ 450 - ( 4.5'- z'?.25)]\ : 100 : {2s0 : [ 4s0-( 4.t2s - 4.25))] : 100 : {250 : [ 450-( 500- 100)]] : 100: [250: (450-400)]:100: (250:50) =100:5=20 0,25 0,25 o?s 0 ?5 I (4,0d) 25<5'<125 =52 <5* <53 =2<x<3 Do d6 x:2;x:3 0,5 0,25 0,2s 1/3