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120123yax2bxcyax2byax2yax2bx+c,yax2,yax2c,yax2bx+c1xyxy=x2(x0)xy1xy2111y=ax2+bx+c(aabc)xyabcabcyax2+bx+cabca0222y=ax2aa0y=ax2a:a0y=ax2aaa1..2.0,11526.:3.2....3mxy=x2+2x78xA3B5C35D35DA(2,)A23,O2.C1,C2______.212y4cmxcmycm2yxAy=24By=2x2Cy=x2+4Dy=2+1624cm3cmxcmycm2yx.8cm2.1.m=2.ABCD3.ayxyxAy=x2+aBy=ax12Cy=a1x2Dy=a1+x24.y=ax2+bx+ca01001n=a+b+cn1.m=2.3.4.2n1.A(-1,1)B(2,4)xA.x-1B.x2C.-1x2D.x-1x22.y=ax2bxcy=axc1.2.1.y=ax2+bx+caAB1%CD2.ABCDABCD1.2.1.2.3.4.5.x1.y=3x2+x4ABCD2.y=4x2+15xA1B1C1D3.xyxxyxx=2xyxxyxx=1.B2.C3.(1)x=0,y000000;001.2.6cmxcmx6yyx1.-1102.y=2+361.ABCAB=ACDBCDEACABEFACDC=DFBC=3EB=4CD=xCF=yyxx2.My=2xMA02B01C12D0121.AB=ACDC=DFB=C=DFCDEACBDE=CBDEFCDx0x32.A