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正比例函數y=kx的影像過點(2,-4)-4=2k k=-2 y=-2x 過影像上一點A作x軸的垂線,垂足為B(4,0), 點A的x座標4 y=-2*4=-8點A的座標(4.-8) 三角形AOB的面積s=|1/2*4*(-8)|=16
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