US 2017 Math kangaroo Problems Level 11-12-教师用卷

US2017MathkangarooProblemsLevel11-12-教师用卷教师用卷1、【来源】2017年袋鼠数学竞赛(MathKangaroo)竞赛第1题(US2017MathkangarooProblems,Level11−12,Question#1)20⋅172+0+1+7=（）．A.3.4B.17C.34D.201.7E.340【答案】C;【解析】N/A.2、【来源】2017年袋鼠数学竞赛(MathKangaroo)竞赛第2题(US2017MathkangarooProblems,Level11−12,Question#2)BenlikestoplaywithhisH0-modelrailroad.HemodeledsomethingsintheH0-ratioof1:87,evena2cmhighmodelofhisbrother.HowtallisBen'sbrother?（）A.1,74mB.1,62mC.1,86mD.1,94mE.1,70m【答案】A;【解析】N/A.3、【来源】2017年袋鼠数学竞赛(MathKangaroo)竞赛第3题(US2017MathkangarooProblems,Level11−12,Question#3)Inthefigurewesee10islandsthatareconnectedby15bridges.Whatisthesmallestnumberofbridgesthatneedtobeeliminatedinordertomakeitimpossibletogetfrom���to���byusingthebridges?（）