如图，正三棱柱 所有棱长都是2，D棱AC的中点，E是 棱的中点，AE交 于点H. （1）求证： 平面 ；（2 （2014?宜宾二模）如图，三棱柱ABC-A1B1C1的所有...
\u5982\u56fe\uff0c\u5728\u6b63\u4e09\u68f1\u67f1ABC-A1B1C1\u4e2d\uff0c\u5404\u68f1\u957f\u90fd\u7b49\u4e8ea\uff0cD\u3001E\u5206\u522b\u662fAC1\u3001BB1\u7684\u4e2d\u70b9\uff0c\uff081\uff09\u6c42\u8bc1\uff1aDE\u662f\u5f02\u9762\u76f4\u7ebfAC1\uff081\uff09\u8bc1\u660e\uff1a\u8fc7D\u5728\u9762AC1\u5185\u4f5cFG\u2225A1C1\u5206\u522b\u4ea4AA1\u3001CC1\u4e8eF\u3001G\uff0c\u5219\u9762EFG\u2225\u9762ABC\u2225\u9762A1B1C1\uff0c\u2234\u25b3EFG\u4e3a\u6b63\u4e09\u89d2\u5f62\uff0cD\u4e3aFG\u7684\u4e2d\u70b9\uff0cED\u22a5FG\uff0e\u8fdeAE\uff0cC1E\u2235D\u3001E\u5206\u522b\u4e3aAC1\u3001BB1\u7684\u4e2d\u70b9\uff0c\u2234AE=EC1\uff0cDE\u22a5AC1\uff0e\u53c8\u2235\u9762EFG\u22a5BB1\uff0c\u2234ED\u22a5BB1\uff0c\u6545DE\u4e3aAC1\u548cBB1\u7684\u516c\u5782\u7ebf\uff0c\u2235EC1\uff1d52a\uff0cDC1\uff1d22a\uff0c\u2234DE=32a\uff0e\uff082\uff09\u7531\uff081\uff09\u53ef\u5f97DE\u22a5\u5e73\u9762AC1\uff0c\u2234\u5e73\u9762AEC1\u22a5\u5e73\u9762AC1\uff0c\u2234\u4e8c\u9762\u89d2E-AC1-C\u4e3a90\u00b0\uff0e\uff083\uff09\u8bbe\u70b9C1\u5230\u5e73\u9762ACE\u7684\u8ddd\u79bb\u4e3ah\u5728\u25b3AEC\u4e2d\uff0cAE=CE=52a\uff0cAC=a\uff0c\u2234S\u25b3AEC\uff1d12\u00d7a\u00d7a\uff1d12a2\u2235VA?CEC1\uff1d13\u00d712\u00d7a\u00d7a\u00d732a\uff0cVA?CEC1\uff1dVC1?AEC\u2234<span dealflag="1" class="MathZyb" mathtag="math" style="whiteSpace:nowrap;word
\uff081\uff09\u8bc1\u660e\uff1a\u4ee5DA\u6240\u5728\u76f4\u7ebf\u4e3ax\u8f74\uff0c\u8fc7D\u4f5cAC\u7684\u5782\u7ebf\u4e3ay\u8f74\uff0cDB\u6240\u5728\u76f4\u7ebf\u4e3az\u8f74\u5efa\u7acb\u7a7a\u95f4\u76f4\u89d2\u5750\u6807\u7cfb\uff0c\u5219A\uff081\uff0c0\uff0c0\uff09\uff0cC\uff08-1\uff0c0\uff0c0\uff09\uff0cE\uff08-1\uff0c-1\uff0c0\uff09\uff0cA1\uff081\uff0c-2\uff0c0\uff09\uff0cC1\uff08-1\uff0c-2\uff0c0\uff09\uff0cB\uff080\uff0c0\uff0c3\uff09\u2234AE=\uff08-2\uff0c-1\uff0c0\uff09\uff0cA1D=\uff08-1\uff0c2\uff0c0\uff09\uff0cBD=\uff080\uff0c0\uff0c-3\uff09\u2234AE?A1D\uff1d0\uff0cAE?<div styl
| (1)参考解析；(2) ；(3) 扩展阅读：正三棱柱的外接球图 ... 正三棱柱的三面投影图 ... 三棱柱的截面演示图 ... 正三棱柱晶胞示意图 ... 正三棱柱三视图怎么画 ... 补画正三棱柱的左视图 ... 正三棱柱建系示意图 ... 三棱柱的三面投影画法 ... 穿孔三棱柱的左视图怎么画 ... 本站交流只代表网友个人观点，与本站立场无关 |
