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歡迎您訪問數學考題練習:直線y=-x+6與x軸、y軸所圍成的三角形的面!

數學考題練習:直線y=-x+6與x軸、y軸所圍成的三角形的面

更新時間:2024-01-12 16:27:12作者:貝語網校

直線y=-x+6與x軸、y軸所圍成的三角形的面積是

A.60

B.30

C.20

D.不能確定

試題答案

B

試題解析

首先求出直線y=-x+6與x軸、y軸的交點坐標,然后根據三角形的面積公式,得出結果.

解答:令y=0,得x=10;令x=0,得y=6;

∴直線y=-x+6與x軸、y軸的交點的坐標分別為A(10,0),B(0,6),

故S△AOB=×10×6=30.

即直線y=-x+6與x軸、y軸所圍成的三角形的面積是30.

故選B.

點評:此題考查的是一次函數圖象上點的坐標特點及三角形的面積公式.一次函數y=kx+b與x軸的交點為(-,0),與y軸的交點為(0,b).

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