八年级上册数学期末考试试题卷及答案.pdfVIP

八年级上册数学期末考试试题卷及答案

Lastsemesterexam

Grade8MathematicsFinalExam

Time:90minutes。Fullmarks:120points)

Part1:Carefullychoose(10ns。3pointseach。total30

points)

1.Whichofthefollowingfourpatternsisasymmetricalfigure。

()

ABCDseal

Donotanswerwithinthebindingline

2.Ifoneangleofanisoscelestriangleis50°。whatarethe

degreesoftheothertwoangles。()

A。65°。65°B。50°。80°

C。65°。65°or50°。80°D。50°。50°

3.Whichofthefollowingnsisfalse。(1)Thereisnoreal

numberwiththesmallestabsolutevalue。(2)Thepoint

correspondingtoannalnumberdoesnotexistonthenumberline。

(3)Thereexistsarealnumberthatisequaltoitsownsquareroot。

(4)Numberswitharadicalsignareallnalnumbers。(5)Thereare

infinitelymanypointsonthenumberlinethatrepresentnal

numberseenthepointthatis2unitsawayfromtheorigin。()

A。2B。3C。4D。5

4.Foranyintegern。whatistheintegerthatcandividethe

algebraicn(n+3)(n-3)-(n+2)(n-2)。()

A。4B。3C。5D。2

5.Ifpoint(-4.y1)andpoint(2.y2)arebothontheliney=-

x+2.whatisthenshipeeny1andy2.()

A。y1y2B。y1=y2

C。y1y2D。Cannotbecompared

6.Whichofthefollowingnsiscorrect。()

A。x2+x2=2x4B。a2·a3=a5

C。(-2x2)4=16x6D。(x+3y)(x-3y)=x2-3y2

7.Asshowninthefigure。iftherectangularpaperABCDis

foldedalongthediagonallinetooverlapandformtriangleEBD。

whichofthefollowingstatementsisincorrect。()

A。TriangleEBDisanisoscelestriangle。andEB=ED.

B。Afterfolding。∠ABEand∠CBDarealwaysequal.

C。Theresultingshapeafterfoldingisasymmetricalfigure.

D。TrianglesEBAandEDCmustbecongruenttriangles.

8.IntriangleABC。theperpendicularbisectorsofsideAB

intersectBCandACatpointsDandE。respectively。AE=3cm。