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如图是抛物线y1=ax2+bx+c(a≠0)图象的一部分,抛物线的顶点坐标A(1,3),与x轴的一个交点B(4,0),直



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y=ax2+bx+cͼλüabcĹϵ
y=ax2+bx+c ͼλü abc Ĺϵ a0 ʱ,,a Խ,ԽС.ڶԳ x=- С;ڶԳ x=- (- b ...
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ͼ ֱڵA(0,8)B(...1 2 ? 1 ,ax2-5x+c=0,7x2+1=0, ...+bx+c(a0)ͼһ,x=1 ǶԳ,...
2015ʡʩпѧԾ
C.40 D.70 ) 4. (3 ) (2015?ʩ) y= A.x2 B.x>...=ax +bx+c ͼһ,ͼ A(3, 0) ,ԳΪֱ x=1,...
κy=ax2+bx+c(a0)ͼ
(x-h)2+k y=ax2+bx+c (0,0) (h,0) (h,k) () Գ x=0 x=h x=h x= h>0 ʱ,y=a(x-h)2 ͼ y=ax2 ...
y=ax2+bx+cĶΪD(-1,2),xһA...
ѡ ѧ κͼ y=ax2+bx+cĶΪD(-1,2),xһAڵ(-3,0)(-2,0)֮,ͼͼ,½:...
2015ѧһ¿ģԾ1,2
+bx+c (a0) ͼһ, ߵĶ A (1, 3) , x һ B(4,0) ,ֱ y2=mx+n(m0) A,B , ...
22.1.3κy=ax2+bx+c(a0)ͼͬϰ(...
22.1.3κy=ax2+bx+c(a0)ͼ...1 D x Ϊ(-1,0) ,(3,0)...õߵĶΪ( A (-2,3) 2 )...
ͼǶκy=ax2+bx+c(a0)ͼһ,x=-1Ƕ...
ͼκy=ax2+bx+c(a0)ͼһ,x=-1ǶԳ,ж:b-2a=0;4a-2b+c<0;a-b+c=-9a;(-3,y1),(...
ͼ,κy=ax2+bx-3ͼxA(-1,0),B(3,0..._ٶ
ͼ,κy=ax2+bx-3ͼxA(-1,0),B(3,0),yڵC.ߵĶΪM. (1)Ľʽ;...
ͼ,y=ax2+bx+cxڵA(-1,0),Ϊ(...
ͼ,y=ax2+bx+cxڵA(-1,0),Ϊ(1,n),y(0,2)(0,3)֮(˵),н:...
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