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函數y=2x+m與y=-2x+m的影像與X軸圍成的三角形面積為2,y=2x+m與x,y軸的分別為(-m/2,0)(0,m);y=-2x+m與x,y軸的分別為(m/2,0)(0,m) 三角形面積為2 1/2XmX(2Xm/2)=2 m的平方=4 m用兩種情况 即m=±2
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