Question

数学题。第二小题。谢谢咯

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Answer 1

∠AFC＝120°
在AC上截取AG＝AE，连接FG
先证明△AEF≌△AGF，再证明△DFC≌△GFC

追问

怎么截取

Answer 2

http://m.baidu.com/from=1000780a/bd_page_type=1/ssid=0/uid=0/baiduid=D441ED3419876B6D80FE8DC6A8E331A4/w=0_10_%E6%90%9E%E7%AC%91%E7%94%B5%E5%BD%B1/t=zbios/l=1/tc?ref=www_zbios&pu=sz%401320_480%2Ccuid%40guvlalu0SigSO2fzgaHe8lPgvu0IaS8QluvMiY8hSa8oav8ggu2gi_aHvi_3a2fDA%2Ccua%40_avLC_aE-i4qywoUfpw1zyaBXi45a2iLA%2Ccut%40ykHI9pPL2iliI2NJ_hvUhguiDCHQhHhdB%2Cosname%40baiduboxapp%2Cctv%402%2Ccfrom%401000575g%2Ccen%40cuid_cua_cut%2Ccsrc%40app_mainbox_txt%2Cta%40zbios_2_4.0_6_&lid=12099893426607563917&order=1&vit=osres&fm=almi&tj=2Gk_1_0_10_l17&waplogo=1&src=http://m.baidu.com/from=1000780a/pu=sz%25401320_480%252Ccuid%2540guvlalu0SigSO2fzgaHe8lPgvu0IaS8QluvMiY8hSa8oav8ggu2gi_aHvi_3a2fDA%252Ccua%2540_avLC_aE-i4qywoUfpw1zyaBXi45a2iLA%252Ccut%2540ykHI9pPL2iliI2NJ_hvUhguiDCHQhHhdB%252Cosname%2540baiduboxapp%252Cctv%25402%252Ccfrom%25401000575g%252Ccen%2540cuid_cua_cut%252Ccsrc%2540app_mainbox_txt/s?tn=zbios&sa=re_1&word=%E9%A3%9E%E8%99%8E%E5%87%BA%E5%BE%81

Answer 3

初中的