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因為直線y=3x+p與直線y=-2x+q的圖像交x軸於同一點,也就是說,直線y=3x+p與x軸的交點與直線y=-2x+q與x軸的交點為同一點.直線與x軸的交點座標為(-b/k,0),所以-p/3=q/2整理得:3q+2p=0
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