SAT学真题精选.doc

+3=9,whatisthevalueof4x–3?(A)5(B)9(C)15(D)18(E)(t+u)+3=19,thent+u=?(A)3(B)4(C)5(D)6(E)-coordinate(坐标)planeabove,thelinecontainsthepoints(0,0)and(1,2).IflineM(notshown)containsthepoint(0,0)andisperpendicular(垂直)toL,whatisanequationofM?(A)y=-1/2x(B)y=-1/2x+1(C)y=-x(D)y=-x+2(E)y=-,3,and15,whichofthefollowingisalsodivisiblebythesenumbers?(A)K+5(B)K+15(C)K+20(D)K+30(E)K+?(A)800(B)1,000(C)1,100(D)1,300(E)1,=1andrsum=0,whichofthefollowingmustbetrue?(A)r<1(B)s<1(C)u=2(D)r=0(E)m=(连续整数)is–,howmanyintegersareinthisset?(A)126(B)127(C)252(D)253(E),300juniors,’snameisplacedinthelottery3times;eachjunior’sname,2time;andeachsophomore’sname,’snameischosenatrandomfromthenamesinthelottery,whatistheprobabilitythatasenior’snamewillbechosen?(A)1/8(B)2/9(C)2/7(D)3/8(E)1/2SAT考试数学练****题(一)(x)=x²–3,wherexisaninteger,whichofthefollowingcouldbeavalueoff(x)?资料个人收集整理,勿做商业用途 I6 II0 III-6 ,IIandIII CorrectAnswer:A 解析: ChoiceIiscorrectbecausef(x)=6whenx=(x)=0,x²(x)=0,x²wouldhavetobe–3butsquarescannotbenegative.(Theminimumvalueforx2iszero;hence,theminimumvalueforf(x)=-3)资料个人收集整理,勿做商业用途 +7beanintegergreaterthan1andlessthan200?资料个人收集整理,勿做商业用途 CorrectAnswer:C 解析: 1<4n+7<,or--2oranyothernegativeintegerortheexpression4n+<(200-7)/