七年级下册数学期末测试题及答案.pdf

（10330）1.（-0.25）2014 X（-4）2015（）A.-1B.1C.-4D.4 2.x-2y=x+5x（）A.-1B.-2C.1D.2）4.（）A.2a-2=B.-2a2=4a2C.2aX 3b=5abD.3a4 2a4=5.xy10（）A.B.30C.10D.6.1200200（）A.1200B.C.200D.7.（-）?（x-3）（）A.2B.C.D.8.-=7k（）A.-1B.0C.1D.6 9.ab()A.B.C.D.10.ADBDF 3二41=50 2=130CBD()A.45 B.50 C.60D.65 (8324)11.3x3-6x2y+3xy2二 _.12.ab8匕=鸟3=2-3=2(-4)X(-4)叙-2)=_.13.-22+(-2)2-(-)-仁 _.14.(6a3+3a2)6a=(a+1)(a+2)a 15.(1)1615161716.ABCABB,CAB=50ABC=100CBE.17.(100)()7079;.18.2508675%xy：(819208;21226；23248；2510261266)19.(1)(-2a2b2)2 x a2bx-2a(a-3)(2)(a+1)+a-1 12.20.()(1)-1=(2)21./5(1)；(2)？(3)？22.DAFF BD,AB/DC.：T/DAF=F(_),AD/BF(_,DDCF(_)vZ B=Z D(_),/B=Z DCF(_),AB/DC(_.23.(x-2)(x+3)=x2+x-6(X2+X-6)(x-2)=x+3x2+x-6 x-2x-2X2+X-6x=2x2+x-6=0.(1)(x+2)(x+3)=x2+5x+6(x2+5x+6)(x+2)=x+3 x2+5x+6x2+5x+6x=_ x2+5x+6=0.(2)x2+mx-14x+2m.24.AB/CD BDZ ABC CEZ DCF Z ACE=90 (1)BDCE？；(2)ACBD？.25.200170A B2(-)|AB351800 4103100(1)AB；(2)3014000？；.26.40.210.(1)？(2)4.52.5？(10330)12345678910 CCDDADBCBD(8324)11.3x(x-y)2;12.1;13.2;14.-;15.4;16.30;17.17;18.(819208;21226；23248；2510261266)19.(1)=4a4b4X a2bx-2a(a-3)=2a6b5x-2a(a-3)=2a2-2a2+6a=6a(a+1)+二 x+=+alaM-1,a=2=5.20.(1)-1=(x+2)(x-1)x(x+2)-(x+2)(x-1)=3 x2+2x-x2-x+2=3 x=1x=1x=1(x+2)(x-1)=0 x=1.X 2+X 3-y=0 y=0,y=03x=9x=3.21.(1)/5504525(2)5 4%=125)125；(3)360 X=72,7222.:vZ DAF=FU)，AD/BF(),Z D=Z DCF)vZ B=Z D(),Z B=Z DCF),AB/DC).23.(1)x+2 x+3;x+2 x+3;-2-3;vx2+mx-14x+2 (x+2)(x+n)=x2+mx-14 v(x+2)(x+n)=x2+(n+2)x+2n 2n14n=-7 vn+2=m m=-7+2=-5 m-5.24.(1)BDCEv AB/CD Z ABCZ DCF v BDZ ABC CEZ DCF Z 2=Z ABC Z 4=Z DCF Z 2=Z 4,BD/CE;(2)ACBDv BD/CE DGC ACE=180 v/ACE=90,/DGC=180-9O =90 ACL BD.25.(1)Bxy B250210(2)AaB(30-a)(250-200)a+(210-170)(30-a)=14000 a=20,30-a=10()14000A20B10.26.(1)x2x+=x=15x=152x=30,1530（2）4.5 X 15=67.5（）2.5 X 30=75（）4.5 X 10+2.5 X 10=70（）.