二次函数个性辅导讲义(2)

001211200123I2II2III0X1.02.012123.12344.12125.12121.2.3.4.5.126.12327.8yxx321012345y125034305126.,A.B..C.D.7.y=ax2+bx+cy0xAx0x2B0x2Cx1x3D18.405001109.10.22.5111.OABCO(00)A(100)B(8)C(0)TOA()AAB(TTPABPTt)S(1)OABAABSt(2)t(3)St12.30.,A.7B.6C.5D.49.ABCD10.1y=x2-4xACB1(BACxACABCDD.(1)2(2)D2(3)ABCD(11.xABAByCACB=90(1)(2)DEFGDGABEFBCACOD=xDEFGSSx(3)(1)2xAB(AB)D'EFGB(GD)EFD'EFG12.x0123312y0313.AyAxy2ByBxy2.443.212AB1014.yax2bxcABCx0(1)(2)yax2bxcx0(3)yax2bxcy1..y=2x2+mx-5xA(x1,0B(x20),xA.3B.-3C.3-3D.2.03.k012124.5.126.40500110(1)55(2)xyyx(3)7.10-5024P