1在△ABC中a的平方—c的平方+b的平方=ab则角c为多少度2在△ABC a:b:c=3:5:7则△ABC最大角为3在△ABC中A=60°b=1 S△ABC=根号3 则sin分之a= 4 在△ABC中设三角形边长为a b c 化简b倍cosc+c倍cosb= 5在△ABC中角AB
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![1在△ABC中a的平方—c的平方+b的平方=ab则角c为多少度2在△ABC a:b:c=3:5:7则△ABC最大角为3在△ABC中A=60°b=1 S△ABC=根号3 则sin分之a= 4 在△ABC中设三角形边长为a b c 化简b倍cosc+c倍cosb= 5在△ABC中角AB](/uploads/image/z/5426269-61-9.jpg?t=1%E5%9C%A8%E2%96%B3ABC%E4%B8%ADa%E7%9A%84%E5%B9%B3%E6%96%B9%E2%80%94c%E7%9A%84%E5%B9%B3%E6%96%B9%2Bb%E7%9A%84%E5%B9%B3%E6%96%B9%3Dab%E5%88%99%E8%A7%92c%E4%B8%BA%E5%A4%9A%E5%B0%91%E5%BA%A62%E5%9C%A8%E2%96%B3ABC+a%3Ab%3Ac%3D3%3A5%3A7%E5%88%99%E2%96%B3ABC%E6%9C%80%E5%A4%A7%E8%A7%92%E4%B8%BA3%E5%9C%A8%E2%96%B3ABC%E4%B8%ADA%3D60%C2%B0b%3D1+S%E2%96%B3ABC%3D%E6%A0%B9%E5%8F%B73+%E5%88%99sin%E5%88%86%E4%B9%8Ba%3D+4+%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%E8%AE%BE%E4%B8%89%E8%A7%92%E5%BD%A2%E8%BE%B9%E9%95%BF%E4%B8%BAa+b+c+%E5%8C%96%E7%AE%80b%E5%80%8Dcosc%2Bc%E5%80%8Dcosb%3D+5%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%E8%A7%92AB)
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