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歡迎您訪問數學考題練習:如圖,二次函數y=x2-4x+3的圖象交x軸于!

數學考題練習:如圖,二次函數y=x2-4x+3的圖象交x軸于

更新時間:2024-01-12 12:54:34作者:貝語網校

如圖,二次函數y=x2-4x+3的圖象交x軸于A,B兩點,交y軸于C,則△ABC的面積為

A.6

B.4

C.3

D.1

試題答案

C

試題解析

根據解析式求出A、B、C三點的坐標,即△ABC的底和高求出,然后根據公式求面積.

解答:在y=x2-4x+3中,當y=0時,x=1、3;當x=0時,y=3;

即A(1,0)、B(3,0)、C(0,3)

故△ABC的面積為:×2×3=3;

故選C.

點評:本題考查根據解析式確定點的坐標.

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