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2013-2014学年北京市朝阳区八年级(上)期中数学试卷【精品文档】


---- 2013-2014 3 24 13.00 A1cm2cm3cm B2cm3cm4cmC3cm4cm5cmD4cm5cm 6cm 23.00 4 A B C D 33.00 30 A6 B9 C12 D15 43.00 A3a2a2=2 Ba23=a5 Ca3a6=a9 D2a22=2a4 53.00 EBFC EB=CFA=D ABCDEF AAB=DE BDFAC CE=ABC DABDE 63.00 40 A50 B70 C100D140 73.00 x2n=3 x3n24x22n A12 B C27 D 83.00 ABC AB=ACADBC DDEAB EDFAC FAD BACDA EDFAE=AFAD AB 1 21 AC A1 B2 C3 D4 3 24 93.00 3a2bab23= 103.00 ABC B=40C 100A= 113.00 1=2 SAS ABDACD 123.00 1440 133.00 ABC C=90AD BAC DEAB E CB=6 BD+DE= 143.00 Am+12 B2n+1 y m= n= 153.00 ABC AB=8 BC=5AB DE AB D AC EBEC 2 21 163.00 3941=402124852=502226575=702 528397=90272... mn 52 178.00 1 2 184.00 A=30B=40EFB=95 D 195.00 AB=ADAC=AE1=2BC=DE 205.00 ABC AB=AD=DCC=40BAD 214.00 l1 l2 AB AB 3 21 l1l2 C C 226.00 xOy A13B52C30 1ABC 2ABC x A1B1C1 A1B1C1 3A1B1C1 y A2B2C2 A2B2C2 A2B2C2 ABC 236.00 B ab ab 1 B 2 A y B BCAB x CBA=BC 4 21 246.00 ABCD ADBCE AB DE CB F G BC GDF=ADF 1ADEBFE 2 EG EG DF 258.00 ABC BAC=90DE ABAC AD=AEAFBE BC F F FGCD BE G AC M 1ADCAEB 2EGM 3 BGAF FG 5 21 2013-2014 3 24 13.00 A1cm2cm3cm B2cm3cm4cmC3cm4cm5cmD4cm5cm 6cm A32=13+2 A B4324+3 B C5435+4 C D6546+5 D A 23.00 4 A B C D 4 3 D 33.00 30 A6 B9 C12 D15 =36030=12 C 43.00 A3a2a2=2 Ba23=a5 Ca3a6=a9 D2a22=2a4 6 21 A3a2a2=2a2 A Ba23=a6 B Ca3a6=a9 C D2a22=4a4 D C 53.00 EBFC EB=CFA=D ABCDEF AAB=DE BDFAC CE=ABC DABDE A DE=AB SSAABCDEF A B DFACDFE=ACB AAS ABCDEF B CE=ABC AAS ABCDEF C D ABDEE=ABC AAS ABCDEF D A 63.00 40 A50 B70 C100D140 AB=AC B=C=40 A+B+C=180 A=100 C 7 21 73.00 x2n=3 x3n24x22n A12 B C27 D x2n=3 = x2n34x2n2= 33432=12 A 83.00 ABC AB=ACADBC DDEAB EDFAC FAD BACDA EDFAE=AFAD AB AC A1 B2 C3 D4 AB=ACADBC AD BAC DEABDFAC DE=DF ADE ADF ADEADFHL ADE=ADF DA EDF 8 21 AE=AF AD BAC AD ABAC 4 D 3 24 93.00 3a2bab23= 3a5b7 =3a2ba3b6=3a5b7 3a5b7 103.00 ABC B=40C 100A= 60 ABC B=40C 100 A=10040=60 60 113.00 1=2 SAS ABDACD BD=CD ABD ACD 1=2AD=AD BD=CD SAS ABDACD BD=CD 123.00 1440 10 7 35 nn2180=1440 n=10 9 21 103=7 =35 10735 133.00 ABC C=90AD BAC DEAB E CB=6 BD+DE= 6 C=90AD BAC DEAB CD=DE BD+DE=BD+CD=BC BC=6 BD+DE=6 6 143.00 Am+12 B2n+1 y m= 1 n= 1 Am+12 B2n+1 y m+1=2n+1=2 m=1n=1 11 153.00 ABC AB=8 BC=5AB DE AB D AC EBEC 13 10 21 DE AB AE=BE BEC =BE+CE+BC=AE+CE+BC=AC+BC AB=8 AC=AB=8 BEC =8+5=13 13 163.00 3941=4021

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