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2022-2023(±)

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14.(2fr)É£tHÆ5GWW&y=ax2+bx+c(a^O)fiM,-^j$Èÿ7â

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X...12345678

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ax~+bx+c

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[##rl(I)

(2)©t^mWW;

(2)PxD(m,-/?î2+2ni+3)>WÜE(.m,m+1),DE=-m2+2m+3-(m+1)

=-m2+m+2=-Cm-1)2+l,DE

24

WÆEPW-lAfà.

[W^lW:(D’.'-^^y=x+/>MSOAC(2,3),

:.3=2+b,

mb=-1,

.'.—y=x+l,

Sy=0B4,x=-I,

J.A(-1,0),

CÔ<]élétzF^À}’=ar2+2x+cM

|a-2+c=0

14a+4+c=3

wwïa=-1,

1c=3

y=-?+2x+3;

(2)®VA(-I,0),C(2,3).

ADJÜ'Jm<-1H£m>2;

®T&D(m,-m2+2m+3'),PlllE(m,m+1),

ÈâAEAC9PJ-1<m<2,

DE—-m2+2m+3-(m+1)=-irr+m+2—-(w-—)2+—.

24

v-1<0,

242

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A

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v^AADB2=BD

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W<-:

'.‘AD-^ZBAC^^,

.-.Z1=Z2,

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.•.zi=Z3,BD=AE,

DCEC

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E

.-.Z2=Z3,Zl-ZE,

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.-.Z1=Z2,

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.-.ZE=Z3,

:.AE=AC

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ABD=AB

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sy.

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