高一数学题!求解!三题啊啊啊啊啊啊啊急!1.在三角形ABC中.角A,B,C所对的边分别为a,b,c,若cosC=-十分之根号二,cosB=五分之根号五.(1)求cosA的值.(2)若a=根号2,求三角形面积.2.已知o为平面直角坐
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![高一数学题!求解!三题啊啊啊啊啊啊啊急!1.在三角形ABC中.角A,B,C所对的边分别为a,b,c,若cosC=-十分之根号二,cosB=五分之根号五.(1)求cosA的值.(2)若a=根号2,求三角形面积.2.已知o为平面直角坐](/uploads/image/z/5234473-1-3.jpg?t=%E9%AB%98%E4%B8%80%E6%95%B0%E5%AD%A6%E9%A2%98%21%E6%B1%82%E8%A7%A3%21%E4%B8%89%E9%A2%98%E5%95%8A%E5%95%8A%E5%95%8A%E5%95%8A%E5%95%8A%E5%95%8A%E5%95%8A%E6%80%A5%211.%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD.%E8%A7%92A%2CB%2CC%E6%89%80%E5%AF%B9%E7%9A%84%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BAa%2Cb%2Cc%2C%E8%8B%A5cosC%3D-%E5%8D%81%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B7%E4%BA%8C%2CcosB%3D%E4%BA%94%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B7%E4%BA%94.%EF%BC%881%EF%BC%89%E6%B1%82cosA%E7%9A%84%E5%80%BC.%EF%BC%882%EF%BC%89%E8%8B%A5a%3D%E6%A0%B9%E5%8F%B72%2C%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2%E9%9D%A2%E7%A7%AF.2.%E5%B7%B2%E7%9F%A5o%E4%B8%BA%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90)
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