\u0110\u1ec1 thi h\u1ecdc k\u00ec 2 l\u1edbp 11 n\u0103m 2015 m\u00f4n To\u00e1n- THPT L\u01b0\u01a1ng Ng\u1ecdc Quy\u00ean t\u1ec9nh Th\u00e1i Nguy\u00ean t\u1ed5 ch\u1ee9c thi h\u1ebft h\u1ecdc k\u00ec 2 cho h\u1ecdc sinh kh\u1ed1i 11. \u0110\u1ec1 thi hay v\u00e0 b\u00e1m s\u00e1t ki\u1ebfn th\u1ee9c, c\u00e1c em tham kh\u1ea3o \u0111\u1ec1 v\u00e0 l\u1eddi gi\u1ea3i d\u01b0\u1edbi \u0111\u00e2y<\/p>\n
C\u00e2u 3.<\/strong>(4,0 \u0111i\u1ec3m) <\/em>Cho h\u00ecnh ch\u00f3p S.ABCD c\u00f3 \u0111\u00e1y ABCD l\u00e0 h\u00ecnh thang vu\u00f4ng t\u1ea1i A v\u00e0 B, m\u1eb7t ph\u1eb3ng (SAB) v\u00e0 m\u1eb7t ph\u1eb3ng (SAD) c\u00f9ng vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng (ABCD), ,<\/p>\n a) Ch\u1ee9ng minh r\u1eb1ng: SA\u00a0(ABCD)<\/p>\n b) Ch\u1ee9ng minh r\u1eb1ng: (SBC)\u00a0(SAB)<\/p>\n c) T\u00ednh g\u00f3c gi\u1eefa \u0111\u01b0\u1eddng th\u1eb3ng SC v\u00e0 m\u1eb7t ph\u1eb3ng (ABCD).<\/p>\n d) G\u1ecdi M l\u00e0 trung \u0111i\u1ec3m c\u1ee7a c\u1ea1nh CD. T\u00ednh g\u00f3c gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng BM v\u00e0 SC.<\/p>\n <\/p>\n <\/strong><\/p>\n <\/strong><\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" \u0110\u1ec1 thi h\u1ecdc k\u00ec 2 l\u1edbp 11 n\u0103m 2015 m\u00f4n To\u00e1n- THPT L\u01b0\u01a1ng Ng\u1ecdc Quy\u00ean t\u1ec9nh Th\u00e1i Nguy\u00ean t\u1ed5 ch\u1ee9c thi h\u1ebft h\u1ecdc k\u00ec 2 cho h\u1ecdc sinh kh\u1ed1i 11. \u0110\u1ec1 thi hay v\u00e0 b\u00e1m s\u00e1t ki\u1ebfn th\u1ee9c, c\u00e1c em tham kh\u1ea3o \u0111\u1ec1 v\u00e0 l\u1eddi gi\u1ea3i d\u01b0\u1edbi \u0111\u00e2y C\u00e2u 3.(4,0 \u0111i\u1ec3m) Cho h\u00ecnh ch\u00f3p S.ABCD […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[171],"tags":[],"yoast_head":"\n\u0110\u00e1p \u00e1n \u0111\u1ec1 thi h\u1ecdc k\u00ec 2 l\u1edbp 11 n\u0103m 2015 m\u00f4n To\u00e1n- THPT L\u01b0\u01a1ng Ng\u1ecdc Quy\u00ean<\/strong><\/h3>\n