问四道较难的初二几何奥数题,1.如图①,∠ACB=90°,AC=BC,P,Q在斜边上,且∠PCQ=45°,求证:PQ²=AP²+BQ².2.如图②所示,P为等边△ABC内一点,且PA=3,PB=4,PC=5,求∠APB的度数.3.如图③,D,E是△ABC内,求
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 18:42:57
![问四道较难的初二几何奥数题,1.如图①,∠ACB=90°,AC=BC,P,Q在斜边上,且∠PCQ=45°,求证:PQ²=AP²+BQ².2.如图②所示,P为等边△ABC内一点,且PA=3,PB=4,PC=5,求∠APB的度数.3.如图③,D,E是△ABC内,求](/uploads/image/z/14977374-6-4.jpg?t=%E9%97%AE%E5%9B%9B%E9%81%93%E8%BE%83%E9%9A%BE%E7%9A%84%E5%88%9D%E4%BA%8C%E5%87%A0%E4%BD%95%E5%A5%A5%E6%95%B0%E9%A2%98%2C1.%E5%A6%82%E5%9B%BE%E2%91%A0%2C%E2%88%A0ACB%3D90%C2%B0%2CAC%3DBC%2CP%2CQ%E5%9C%A8%E6%96%9C%E8%BE%B9%E4%B8%8A%2C%E4%B8%94%E2%88%A0PCQ%3D45%C2%B0%2C%E6%B1%82%E8%AF%81%EF%BC%9APQ%26sup2%3B%3DAP%26sup2%3B%2BBQ%26sup2%3B.2.%E5%A6%82%E5%9B%BE%E2%91%A1%E6%89%80%E7%A4%BA%2CP%E4%B8%BA%E7%AD%89%E8%BE%B9%E2%96%B3ABC%E5%86%85%E4%B8%80%E7%82%B9%2C%E4%B8%94PA%3D3%2CPB%3D4%2CPC%3D5%2C%E6%B1%82%E2%88%A0APB%E7%9A%84%E5%BA%A6%E6%95%B0.3.%E5%A6%82%E5%9B%BE%E2%91%A2%2CD%2CE%E6%98%AF%E2%96%B3ABC%E5%86%85%2C%E6%B1%82)
xVmOV+R"l49d
Ӥ}
]iP( AЪ,T,/v>v㸡][i4)99y}Sb;llpnKk.v+}..;Q'-H"y%(.OJfV_ E#չM%Y/(:z>c6՛ARv kqA+@ȏ E9RRD@9;("FICcwݽK`Uu~@& <L8D$!8Y
jZ=oD-o/QoڑUZ5h f L#K7 ?̑SA߸ڀnmLjV{з I;.,)v2[cp%:m^
4
lA9E,.Ky*UxHk{Z-Sc}cYkeF
&Gfy $UO45;d#J}2;@F_B\`ڙ^ gD-^aAgzӷnPi?ƾKC;qls7晚NMΤ=1u:'>stB`08LzC!e}x2!6r/dؤ/jyKO2.(%\p*˩\"ɩI'rk/tUڧL%