已知[tex=3.214x1.286]6Wj905euSJVdmlDIZ94qX54pk2a2xoCo+On8BoFChH4=[/tex],且有一点[tex=0.786x1.286]/aLPP1sXG9WQPxIsGVtWrg==[/tex]使[tex=9.786x1.286]vZKBbT0eoTvSPyxBtOcRAVspvm2DMptEvR6+233lcx8=[/tex],则点[tex=0.786x1.286]/aLPP1sXG9WQPxIsGVtWrg==[/tex]必在[tex=3.214x1.286]6Wj905euSJVdmlDIZ94qX54pk2a2xoCo+On8BoFChH4=[/tex]的外部。
举一反三
- [tex=3.214x1.286]6Wj905euSJVdmlDIZ94qX54pk2a2xoCo+On8BoFChH4=[/tex]中,[tex=0.786x1.286]/aLPP1sXG9WQPxIsGVtWrg==[/tex]是内角平分线[tex=1.571x1.286]x09/AHqLRN9oCOYNZklqfA==[/tex]、[tex=1.571x1.286]zKqbMQzpBnn8dTxtKZMBuA==[/tex]、[tex=1.571x1.286]89xWvZluEEq1UJ1AZvFVKg==[/tex]的交点(称[tex=0.786x1.286]/aLPP1sXG9WQPxIsGVtWrg==[/tex]为三角形的内心),过[tex=0.786x1.286]/aLPP1sXG9WQPxIsGVtWrg==[/tex]作[tex=4.429x1.286]SrkPvLcLwuyui2Gf1cA+9WDM1DKQY6HJuuh5MYtByDo=[/tex]于[tex=0.786x1.286]Ick8WleTp/7hma/4IMmoeA==[/tex],求证:[tex=7.429x1.286]6hFqKz6DnojZUTWrMl/iLREUCeaJ43jTCDvc+ArZwGs=[/tex]
- 设[tex=0.786x1.286]/aLPP1sXG9WQPxIsGVtWrg==[/tex]是一个定点,证明:点[tex=1.071x1.286]/vZEgalrrOYkhzS9SMg+fg==[/tex]位于[tex=3.214x1.286]6Wj905euSJVdmlDIZ94qX54pk2a2xoCo+On8BoFChH4=[/tex]上(包括它的边)的充分必要条件是存在非负实数[tex=3.714x1.286]gZWR/uySMTEj9sDZYoVjXPkkE5gQeXmTsVsR3S97LXQ=[/tex],使得[tex=12.929x1.857]5kxdtulOg1rJWKnrGXaX+5iYe5LsqM6vtGmgDNbvBGBUUBGKaMmRJD8ngt0OhlEiFJtJnwHqL7NbNvy6S8Jpobbf4oJFCgwn2O1rqYh/MIE4Jp31FyEY5fUpQi5KJ5nFklsW7WlANqmszHhKr5GIBQ==[/tex],且[tex=6.929x1.286]1xtf76q+xAD8yKVaeCiX8MedN0+368ZR/5aDe8gBotw=[/tex]。
- 已知[tex=5.0x1.286]nNRgYScRPw16N2lBJqtTsA==[/tex],[tex=5.0x1.286]ZIJz5gTGIgdeWAGMFdoL1A==[/tex],则[tex=6.214x1.286]wE5wtWoL9HR6uGPZrIzvHA==[/tex]成立的[tex=0.571x1.286]XubEW9+1+hkJqH7jXe5MrA==[/tex]值为 A: 1 B: 2 C: 4 D: 6 E: 8
- 圆上有四点[tex=0.786x1.286]pi/GsQ3apuRt43V3XQq/tA==[/tex]、[tex=0.786x1.286]q1djlrfSWHAqH21hBgtrSw==[/tex]、[tex=0.786x1.286]TKU5UzNEMzEJwORo6mbEYA==[/tex]、[tex=0.857x1.286]s+r8LBAs3scxfl88DGExcg==[/tex],其中[tex=1.571x1.286]e/M+7IW9tlhsCB6JYdr25Q==[/tex]与[tex=1.643x1.286]xGRLrED4Yu/Z7B5F7BY9Bg==[/tex]相交于点[tex=0.786x1.286]dSWbQCTjdbLxKy7q0ps2gg==[/tex],其中[tex=3.357x1.286]nfuDxCPBvPOGuPBRhZHhCg==[/tex],[tex=3.357x1.286]fKnNBSk4H5tnDBRiow4y5Q==[/tex],[tex=3.286x1.286]vDyWFwfl554FvTdgbOI1Qg==[/tex],则[tex=2.643x1.286]cJGxmmS4iAvxiwJoj5VhgA==[/tex] A: 6 B: 4 C: 3 D: 2 E: 1
- 如图,在[tex=3.214x1.286]6Wj905euSJVdmlDIZ94qX54pk2a2xoCo+On8BoFChH4=[/tex]中,[tex=4.429x1.286]QtgVFpg9JC9NCCWzaC0pWUa6/y/fWQdBPTmkKUlXt4E=[/tex],[tex=0.857x1.286]s+r8LBAs3scxfl88DGExcg==[/tex]在[tex=1.571x1.286]ukjsaMKlckZbkeC3IvycHQ==[/tex]上,已知[tex=7.286x1.286]xrCx2YpDrJ5qIL6az/odoUrKu/mMe0WEKI8sY3sGAqs=[/tex],[tex=0.786x1.286]dSWbQCTjdbLxKy7q0ps2gg==[/tex]是[tex=1.571x1.286]x09/AHqLRN9oCOYNZklqfA==[/tex]上任一点,证明:[tex=9.786x1.286]82Ksd2MIv9k8HYEM1cgtJs7+g7MyJHZ/6DwTnekE8a0=[/tex]。[p=align:center][img=412x316]1786d3973d0fb55.png[/img]