【2021中考數(shù)學(xué)專題復(fù)習(xí)】拋物線與x軸的交點(diǎn)問題

22222222222021年年數(shù)中復(fù)《物與x的點(diǎn)題yaxa+2xyx2axx10A

B

C1D0kOACDA18129Dy

1ACCBAA1

B

C

Dyx+6yxmxy+m1

2222222222222222A73B36Cm3Dmy++cB0yCD，AA

B0

C

D0y

bx+3

+b+3t0txAt7Bttt

Dt3tyaxbxax+m2A1B0D2yp2xqmAmpBmpnqpDmqny+bx+4x10x3xAC0PA11yx4ax2

222122222222122222a12y+3ayD13yxyCACxx3ABC14yxy15x++lByM04b6OM16x+2xbxx1317xxx軸BAPCAC3

222222P18xx2x312x2y19x++3123yx+1ADyF20yx9xAyx+mAD12'D4

2POCBOC2POCBOC21ax+ByCxxHACQAC1222xA30312PPBCP3PS4S△△5

2MAP2MAP23yc012C3ACPP24x10y3AC12DACxQDMS3M△△6

222122122222矩形2212222122122222矩形22122++2xx

0y4xy001x2x++202x++200yx+k+0k6yx+3C318y+

1y0x

xx3103CxDCBA45BDBDCDmCm7

22122212Cy+

1m+mmm0C4yx+mm0xycC0DmcAxx2A208

22222222221212222222222121y+312+bt0+3x+3t0x+3xt343tx+b+3tx1xyxx+3t

7tC+bx+mbx2my+bxymy2mmm19

222222222222Cxqy2mxq0yxpxxnp，yy+bxxx++4eq\o\ac(△,)0410x30rr3PBMAPABOMABPBCPBOMOM+r

+34yx4+1a14+0

222222B2212△1221222222B2212△122112CDyCDC2Dy434y

x4yx+

x4+213x+2x1+11xA3yx+2x3x23xx134414MMAAMNB

y﹣M3M3

2222222212222222222122AMNB23615y+b4044b1604b4+bx+4c0OMhABAhx++h+bmnnhOM99162

b4x5x13x04x2x417x2031xy3CACPCOAOCACx

2222122222221222PCCbPCy3x14P183m3m4yxyx

x3

yy32x

2x

3

3

222222△DEF212222222△DEF21219ybxA0B30

yx322xyxx314x3

D5yx+1x10yxx0y013DDMyMEFDM820x9x3Byx+m

222122222212222122222212m3DAD3

2y+bx+3yx++2++3C3

0CCyx934b1+

b

x+3y+x21yax+B20xyxx+320xx0x3x2xC0ACA3kx+b

222max2222122222max2222122

ACyx+3BAOPHAOAQHPmmmQmmPQmm+3m3mP

+

+1+1PQ

+122x0B1yaxxax1x3Ca1y2BAACx1

2POCBOC2222222PPP2POCBOC2222222PPP++++BC+ACykxACyx1yx1213COC3Px4△△xx44xx+2x3x4+238345

23yxha2604﹣2yx4﹣22x﹣x6C23AC62yy

212221224x2

42

424axxx03yxC03a0+13ayx+1yxx32A1003OA3DC+OCAxOACOCAOACCOAOQ9QQQCy+QCyx3D

2OEPCAEP2