2020年海淀區(qū)初二上期末數(shù)學(xué)試卷及答案

數(shù)學(xué)3）123456789....．2102．2103．0.2102D．0.21036a．32．9aa3．2a3D．a(chǎn)18a3aa4224x4)(x4)．2x4x2．2xx22x4x4x2x4x2．2．216CKC在．CCD和．1DEADBDEK2F．．D2ab2)121ab．1．D．a(chǎn)b2=D是D與CAS和S12BDC=1=2S=S12D16FECBDAGbab4abab.b2.ab+2..aaabADab2aCBbab2）x．34aaa2．B=E與CB．16ABCBCS飛船C與空間站A的實(shí)時(shí)距離，那么S的最大值BAC是．點(diǎn)E在x當(dāng)Ey．x年9月OBx．互．ABDCMONON，，OM，PP3P5P12MOP1P3P5N16，P，POP=PP=PP=PPPPOPP1PPP1PPP34611223344522324△…PPP435MON；MONPPP435．題856題7）101x12y33322863E為..BEDCAababab20aba2216C.A.BCD+2，2+．xabya2b2x；(x4x4)xyx2161．2ABC16Ax4x52Ax21x2=x12(x1)2x2x222xB11123552Ax12(x1)225若mBx2xnAx4x5n22AB．DB；10xb3x4xc-c22．16DC．1DAC（45和BBDAACC圖116Pyl為P；PP1P1l(P2ylPP1P2xO；點(diǎn)AM(3,1)，，(1,ANQ；A，AOAAA1A212與x316A在y，AA1A2AAA12A海淀區(qū)八年級(jí)第一學(xué)期期末調(diào)研（數(shù)學(xué)）參考答案3）123456789ABCCACDCDB2）x3．．xa5．a(chǎn)b(4,0)(6,0)或．1．x2x2．．PPP）22.5123題856題7）133分21619354分2分4分4)x2y23(x2y)(x2y)，=，，分=．=．分分,DAC,,．分分．∵220，aabb2∴()0．a(chǎn)b分2∴．a(chǎn)ba4ab2ab2ab(4a)(4ab)222分分bab2=(bba)0．分16）AEBCFD分，．分．分B,,AC,．，分分．xab2，2+，ay2b2∴，yaab2b2+(ab2．分)abx22∴(．分yx2x4x42分分xyx2x42x4=x(x2)x22(x2)(x2)x4(x2)x216x2x24x2x2分分．D，分分．分1A∵，2．．分分BD∵ACDB1C∴．分2．分DB，∴(26．分Dx2xx2x②7分16．）BEFD分ACEADCAD,，BEBAE902,∴F，，DABEAEB,∴∴AC18045分21），2AEBABE45,CBF.分∴C，ACFAEF135,∴∴∵BCF90,CBFBCF90,分.∴CBF∴1BC.2∴分16(2,5)(5,2)，．）；分分NA,AA12,AOAAA1212AOBAOB30∴12Al11AOCAOC15,1與x；分Al21AOCAOC75,1與x15；分15或與x．yyBBCCAAA21AAA12OxOx圖1圖216x2分O3分分16(2,5)(5,2)，．）；分分NA,AA12,AOAAA1212AOBAOB30∴12Al1