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1、,1,2,3,x,-x1,- x2,1030,20-10,-40-60,(x1,0),( x2,0),y=a(x_) (x_) a0, ,0,-3 4,5 1, 0,0,-3451, 0,c=-3,a-b+c=0,16a+4b+c=5,a= b= c=,y=ax2+bx+c,-3,16a+4b=8 a-b=3,4a+b=2 a-b=3,y=x2-2x-3,0,-3 4,5 1, 0,0,-3451, 0,c=-3,a-b+c=0,16a+4b+c=5,a= b= c=,1,-2,-3,x=0,y=-3; x=4,y=5; x=-1,y=0;,y=ax2+bx+c,1, y=a(x-3)(x+1
2、),0, -3 -1,0 3,0 , y=(x-3)(x+1), y=x2-2x-3, -3=a(0-3)(0+1) a=1,2,14 03,( 0,-3),a-4=-3, y=(x-1)2-4, a=1,x=1y=-4,y=a(x-1)2-4,3,0,-3 4,5 x=1,y=a(x-1)2+k,ABCOAOB13AOBO90DOCCBA,(10),03,-30, ,124x=1y6,2,x,y,1,2,O,1,.,M,N,A,B,A,B,C,A,B,O,O,O,A,B,C,N,M,,x, y=ax2+bx+c (a0), y=a(x-h)2+k (a0), y=a(x-x1)(x-x2) (a0), ,