3.已知动点P(x,y)P(x,y)P(x,y)满足5(x−2)2+(y−1)2=∣3x+4y−7∣5\sqrt{(x-2)^{2}+(y-1)^{2}}=\vert 3x+4y-7\vert5(x−2)2+(y−1)2=∣3x+4y−7∣,则动点PPP的轨迹是((( )))