2004滑铁卢竞赛试题答案

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2005滑铁卢竞赛试题答案

1.(a)Answer:a=5 Since(a,a)lies on the line3x?y=10,then3a?a=10or2a=10or a=5. (b)Answer:(6,2) Solution1 To get from A to B,we move2units to the right and1unit up. x Since C lies on the same straight line as A and B,then to get from B to C we move2 units to the right and1unit up twice,or4units to the right and2units up. Thus,the coordinates of C are(6,2). Solution2 Label the origin as O and drop a perpendicular from C to P on the x-axis. x Then AOB is similar to CP B since both are right-angled and they have equal angles at B. Since BC=2AB,then CP=2AO=2(1)=2and BP=2BO=2(2)=4. Therefore,the coordinates of C are(2+4,0+2)=(6,2). (c)By the Pythagorean Theorem,AO2=AB2?OB2=502?402=900,so AO=30. Therefore,the coordinates of A are(0,30). By the Pythagorean Theorem,CD2=CB2?BD2=502?482=196,so CD=14.

AMC美国高中数学竞赛难题精选

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(完整)春季高考历年真题-2011年天津市春季高考英语试卷

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2018年美国数学竞赛 AMC 试题

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