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1、泾干中学高一数学月考试题命题:仝昌奇一.选择题每题4分,共48分1下列命题正确的是()A.若a∥b,则a与b方向相同B.若a∥b,则a与b方向相反C.a=b,则a与b共线D.a≠b,则a与b不共线2.“两向量的模相等”是“两向量相等”的()A.充分但不必要条件B.必要但不充分条件C.充要条件D.不充分也不必要条件3.化简:〔(2a+8b)-(8a-4b)〕得()A.2a-bB.2b-aC.b-aD.a-b4.e1、e2是两不共线的向量,则a=e1+λe2(λ∈R),与向量b=2e1-e2共线的充要条件是()A.λ=0B.λ=-C.λ=-1D.λ=-25.已知向量a=(1,x)与b=(x,4
2、)的方向相反,则x的值为()A.2B.-2C.±2D.06.已知A(3,2),B(5,-1)且=,则C的坐标为()A.(-8,1)B.(8,-1)C.(4,)D.(-1,-)7.设e1、e2是两个单位向量,它们的夹角为60°,则(2e1-e2)·(3e1+2e2)等于()A.-8B.-C.D.88.已知|a|=2,|b|=3,且a⊥b,又(2a+3b)⊥(λa-b),则λ的值为()A.B.-C.D.-9.已知点P(cosα,sinα)、Q(cosβ,sinβ),则||的最大值为()A.4B.2C.D.110.按向量a=(-5,1)把函数y=3x的图象F平移到F′,则F′的函数解析式为()A
3、.y=3x-5+1B.y=3x+5+1C.y=3x+5-1D.y=3x-5-111.若a=(1,k),b=(-2,3)且(a+b)与(a-b)垂直,则k等于()A.k=2B.k=-2otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecia
4、lCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,MinistersandC.k=±2D.k=12.已知M(-2,7)、N(10,-2)点P在线段MN上,且=-2,则点P的坐标为()A.(-14,16
5、)B.(22,-11)C.(6,1)D.(2,4)otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOffic
6、eoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand二、填空题每题4分13.已知a与b的夹角为120°,且|a|=3,|b|=5,则|a+b|=.14.已知a=(1,4),b=(2,-3),c=(12,-7),且a=mb+nc,则m=,n=15.在△ABC中,A=2C,且a+c=2b,角B.为() 16.设a
7、、b、c是任意的非零平面向量,且相互不共线,则:①(a·b)·c-(c·a)·b=0②|a|-|b|<|a-b|③(b·c)·a-(c·a)·b不与c垂直④(3a+2b)·(3a-2b)=9|a|2-4|b|2中,是真命题的有()三.解答题 17(8分).已知|a|=4,|b|=5,|a+b|=.求:(1)a·b;(2)(2a-b)·(a+3b).18.(8分)设、是两个不共线的非零向量,⑴若=+,=2+8,=3-3,求