XX年扬州市中考数学试卷含答案解析.pdf

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9、 BAB3 146226hx/2x/=6xx/2x/=6x=121 121.8 121.8/ABcDDB=DAFABDFcBEAEAEBDDc=tan DcB=3AEBD AFDA BFEAD=BEAEBD BD=AD EFABcD AD/cE,/DAF=Z EBF/AFD=Z EFB AF=FB AFDA BFE,AD=EB T AD/EB,AEBD BD=AD AEBDABcD cD=AB=AB/cD /ABE=Z DcB,tan/ABE=tanZ DcB=3,AEBD ABDE,AF=FB EF=DF tan ABE=3 BF=,-EF=DE=3,S AEBD?AB?DE=?3=15 A

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11、 oEF=60 F=30 /F=Z EAF,EF=EA=3,PE+PF3RtoPFoP=oF=Rt ABo oB=oA=x 6=2 BP=2-=PE+PFBP30/yxyx2401503600yx=X x3600 xxyxy=10 x+70010 x+700 240 x 46=?y=10 x2+1000 x 21000=102+4000-10v 0,x v 50 x x=46=102+4000=3840 463840150=10 x2+1000 x 21000 150=3600 102=250 x 50=5 x1=55x2=45 45 x55360011D,NEcDNEcPtan cPNcPN

12、N,N/EcDNcPN,D,cPNRt DN1tan cPN2 21ANcPcos cPN 3ABBcAB=4BcABA=Bc,cBN,BN=2BcANcPcPNN,N/EcDN=Z cPN,D,cPNRt DN2DcD D.cPNRt Dc1 Ec/N,/cPN=Z DN tan cPN=tan DN,/DN=90,tan cPN=tan DN=2 22D cDD.cD/AN,/cPN=Z Dc,Dc/Dc=Z D=45,cos cPN=cosDc=.3AN N.Pc/N,/cPN=Z AN A=N,AN=90 /AN=Z AN=45,/cPN=45.1oABcAcPooA1AQAAB2BP

13、Att=2PQcBQPAQtt=1y=x2+bx+cPQy2D,QD=/Q?Dt=2PQoPAQB=Z PAQ=90cBQPAQPAaQBcPA3A cBQ tt=1Q,Q/x=Q,EQ,D,EaA QHDD.1,vA-oA=3 t=2 oP=t=2 AQ=2t=4-P,Q,PQ1,vPAPAQ Ov t v 3,oABc/B=Z PAQ=90 cBQPAQPAQQBct2 15t+9=0 =0 t1=3 t2=PAacBQt2 9t+9=0 t=7,x=cBQ与厶PAQtt=1 PQ,PQy=x2+bx+cy=x2 3x+2=2 Q/x QE=Q,EQ,/E=Z QE=/Q,2QD=/Q=QE DQyH,HQQE=90 EQQH H=2,H,HQy=x+4 x2 3x+2=x+4 x1=3 x2=D;yH,3HQ=/Q=Z QE HoQy=xU,x2 3x+2=x x1=3 x2=D;DDt