广西合浦县联考2022年中考数学最后冲刺浓缩精华卷含解析

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15AC(1)x=0᎛y=-x+2=2,AA(0,2),§A(0,2)ᐭy=(x-1)2+m,BI+m=2:.m=l./.y=(x-1)2+l,AB(1,1)(2)ᵫ(1)©3ªᱥḄA᪆,Cy=(x-1)2+1,VVD(n,2-n),•ᑣ®ªᱥḄA᪆,Cy=(x-n)2+2-n.ᦑᫀoCy=(x-n)?+2-n.(3)জVCo°ªᱥḄ±88CḄ²ᙶ᪗g⊤C(a-1)2+1ᡈ(a-n)2-n+2ᵫ⚪³B(a-1)2+1=(a-n)2-n+2,᦮ᳮB2an-2a=n2-nVn>lঝ78CyḄᚖᚖE,78DDFLCEz8FVZACD=90°,AZACE=ZCDFXVZAEC=ZDFC/.ACE^ACDFAE_CF"eEC-DF,¶(a,a2-2a+2),D(2a,2-2a),/.AE=a2-2a,DF=m2,CE=CF=a•a2-2a--5--------------2aaa2-2a=lABCa=±&+lVn>l

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18AC(1)x2-7x-18=0,(x-9)(x+2)=0,x-9=0,x+2=0,xi=9,x=-2
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