到两定点A(0,0),B(3,4)距离之和为5的点的轨迹方程是( )
3x–4y="0," 且x>0 4x–3y="0," 且0≤y≤4
4y–3x=0,且0≤x≤3 3y–4x=0,且y>0
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到两定点A(0,0),B(3,4)距离之和为5的点的轨迹方程是( )
3x–4y="0," 且x>0 4x–3y="0," 且0≤y≤4
4y–3x=0,且0≤x≤3 3y–4x=0,且y>0