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因為點c在X軸上設點C座標為(X,0)因為點A B都在Y軸上點C在X軸上,X軸垂直Y軸的 所以三角形ABC的高就等於X的絕對值由於AB=1所以S=ABxH/2=15帶入可得X的絕對值=30 所以點C就是(30,0)或(-30,0)
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