1、 2016 房山区初二（上）期末数学 30 3 1 3 9 A 3 B 3 C D 3 2 3 A B C D Q 3 3 x A x 2 B x 2 C x 2 D x 2 4 3 2 + A B C D 5 3 a b a b a+b A 6 B 7 C 8 D 9 6 3 A 1 B 1 C 0 D 1 7 3 A B C D 8 3 3 4 3 4 A 1 B C D 9 3 30 A 60 B 120 C 60 150 D 60 120 10 3 ABC BC 4 16 AC EF AC AB E F D BC M EF CDM A 6 B 8 C 10 D 12 18 3 11 3
2、 3 6 12 3 0 x 13 3 ABC B C BC M N MN AB D CD CD=AC A=50 ACB= 14 3 A B A 102 B 81.6 A 2 400 A B A x 15 3 “ ” “ ” 10 AB BC 1 B B 16 3 1 ABO CDO AOB= COD=90 BOC 1 AD BC OC+OD CO E OE=CO BE OBE OAD BCE AD BC OC+OD 2 2 BCE 30 5 17 5 1 2 + + 18 5 =1 19 5 x 2 +x 3=0 20 5 A B C D BE DF A= F AB=FD AE=FC 21 5
3、 a b 22 5 400 520 2.5 3 / 22 23 24 25 5 26 7 23 5 ABCD BA BC BD ABC DA=DC BAD+ BCD=180 24 5 “ ” x + =1 a x x=a 2 a 2 0 a 2 a 3 1 x =1 m 2 x + = 1 n 25 5 ABC C=90 AC=BC= ABC A 60 AB C BC BC 26 7 ABC ABC=45 AH BC H D AH DH=HC BD BD AC E EH 1 2 BD AC 3 BEH=45 参考答案与试题解析 30 3 1 3 2 =25 9 3 D 2 A B C D C
4、3 x 2 0 x 2 A 4 2 + =2 + =7 B 5 a b a b a=3 b=4 a+b=7 B 6 = = = 1 A 7 A =| 3|=3 A B = = B C C D = = D C 8 3 4 3 4 = D 9 1 60 2 120 D 10 AD ABC D BC AD BC S ABC = BC AD= 4 AD=16 AD=8 EF AC C EF A AD CM+MD CDM = CM+MD +CD=AD+ BC=8+ 4=8+2=10 C 18 3 11 33 6 = 12 0 x 2=0 2x+1 0 x=2 2 13 MN BC CD=BD DBC=
5、DCB CD=AC A=50 CDA= A=50 CDA= DBC+ DCB DCB= DBC=25 DCA=180 CDA A=80 ACB= CDB+ ACD=25+80 =105 105 14 A x / B x 0.24 / = = 15 A B= AB =x AC= x 1 BE=10 BC=5 Rt ABC 5 2 + x 1 2 =x 2 x=13 12 13 12 13 16 ABO CDO AOB= COD=90 OD=OC OA=OB BOE+ AOE=90 AOD+ AOE=90 AOD= BOE OBE OAD OBE OAD BCE AD BC OC+OD OEB B
6、OC S OEB =S BOC =1 S BCE =S OEB +S BOC =2 2 30 5 17 = 2 2 +1 +6 2 = = = 18 x+1 x 1 x x+1 2x 1 = x+1 x 1 x=2 x=2 x+1 x 1 0 x=2 19 = + = + = + = x 2 +x 3=0 x 2 +x=3 = 20 BE DF ABE= D ABE FDC ABE= D AB=FD A= F ABE FDC ASA AE=FC 21 ABC 22 x / 2.5x / =3 x=120 x=120 120 2.5=300 / 300 / 22 23 24 25 5 26 7
7、23 BC E BE=BA DE BD ABC ABD= EBD ABD EBD ABD EBD A= BED DA=DE DA=DC DE=DC C= DEC BED+ DEC=180 A+ C=180 BAD+ BCD=180 24 0 1 x x= m m 2 3 2x+nx 2= x+3 n 1 x=2 x 3=0 x=3 n= n 1=0 n=1 n=1 n= 25 B B ABC A 60 A B C AB =AB B AB = 6 0 A BB AB =B B =AB BC AB D A C = B C BD AB AD= B D C=90 AC=BC= AB= =2 AB = 2 AD= B D= 1 BD= = C D= =1 BC= BD C D= 26 1 1 2 BD=AC BD AC AH BC H ABC=45 ABH AH=BH BAH=45 AHC BHD AHC BHD AC=BD ACH= BDH BDH= ADE ACH= ADE ACH+ DAE=90 ADE+ DAE=90 AEB=90 BD AC 3 AHC BHD 1= 2 2 H HF HE BE F FHE=90 4+ 5=90 3+ 5= AHB=90 3= 4 AHE BHF AHE BHF EH=FH FHE=90 FHE BEH=45
