0%
20
AL
坐標平面上,若二次函數y=a(x-102)('-100)+圖形的頂點坐標為(h,12)
,將此二次函數圖形向下平移9個單位長後與x軸交於A、B兩點,且AB=2,則
a的值為何?
202321
2024
(B)-1
(C)-2
(D)-3
14 (10, 14), (1, k) (h.3)
y=a (x²-30 > x+10200) +1 (00, k-9), (103, k-9)
= k = 9
h=100+102-101
of = ax² - 20sax+10200 +12, 3 = a(x-1013712
fε ((00, 9)
18. 如右圖,以O為圓心,BD為直徑作一半圓,A、E兩點在圓周
A