⣨8С⡣ÿС3֣24֣ 13֪x2 -3x+k=0ȵʵk= . 14ͼRtOABУAOB=30㣬OABƵOʱת100õOA1B1A1OB=
15κy=x4x+5y=xh+kʽy=
2
2
A1BAB1O14ͼ
16֪Oİ뾶Ϊ25cmAB=40cmCD=48cmABCDƽABCD֮ľ
17A(1,4)B(2,1)㣬ԳΪx1ߵĽʽ 18ͼABΪOֱCDΪOңACD=25㣬BADĶΪ
19ͼABACOڵBCA=50bPΪOBCһ㣬BPCĶΪ .
20ͼPy=2x22Գϵһ㣬ֱx=tƽyᣬֱy=x߽ڵABABPԵABΪֱǶĵֱΣtֵt=
19
⣨6С⡣60֣
218֣֪ߵĶΪ14ҹ㣨25 1߽ʽ
2ֵy0ʱԱxȡֵΧ
228֣СΧһܳΪ60ľγأSλƽףһ߳xλףı仯仯
1Sx֮ĺϵʽдԱxȡֵΧ 2xǶʱγSǶ٣
2310֣ͼıABCDڽڡODAEıABCDһǣADƽ֡CAE ֤DB=DC
2410֣֪ABCڽڡOAֱEF.
(1)ͼ٣ABΪOֱҪʹEFΪOߣҪӵһ(˵)_________________________________________________
(2)ͼڣABDzԲOңҡCAEBôEFǡO֤жϣ
2512֣ABCDУECDһ㣬
1ADEƵA˳ʱ뷽תʹADABغϣõABFͼ1ʾ۲֪DEȵ߶ AFB=
2ͼ2ABCDУPQֱBCCDϵĵ㣬ҡPAQ=45㣬ͨתķʽ˵DQ+BP=PQ
3ڣ2УBDֱAPAQMN㻹ת˼˵BM+DN=MN
2
2
2
2612֣ͼA04y=COΪԭ㣮
12
x+bx+cxཻڵB102
1ߵĽʽ
2y=x+bx+cƽƸλȣƽmm0λȣõߣߵĶPڡABCڣmȡֵΧ
3x·ͼxԳƣõµĺͼCֱy=x+kͼCʼ3㣬kȡֵΧ
2