正弦,余弦函数的几道基础题1.在三角形ABC中,已知下列条件,解三角形(角度精确到1º,边长精确到1cm)①A=70º,C=30º,c=20cm②b=26cm,c=15cm,C=23º③a=49cm,b=26cm,C=107º④a=31cm,b=42cm,c=27cm
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![正弦,余弦函数的几道基础题1.在三角形ABC中,已知下列条件,解三角形(角度精确到1º,边长精确到1cm)①A=70º,C=30º,c=20cm②b=26cm,c=15cm,C=23º③a=49cm,b=26cm,C=107º④a=31cm,b=42cm,c=27cm](/uploads/image/z/3800199-39-9.jpg?t=%E6%AD%A3%E5%BC%A6%2C%E4%BD%99%E5%BC%A6%E5%87%BD%E6%95%B0%E7%9A%84%E5%87%A0%E9%81%93%E5%9F%BA%E7%A1%80%E9%A2%981.%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5%E4%B8%8B%E5%88%97%E6%9D%A1%E4%BB%B6%2C%E8%A7%A3%E4%B8%89%E8%A7%92%E5%BD%A2%EF%BC%88%E8%A7%92%E5%BA%A6%E7%B2%BE%E7%A1%AE%E5%88%B01%26ordm%3B%2C%E8%BE%B9%E9%95%BF%E7%B2%BE%E7%A1%AE%E5%88%B01cm%29%E2%91%A0A%3D70%26ordm%3B%2CC%3D30%26ordm%3B%2Cc%3D20cm%E2%91%A1b%3D26cm%2Cc%3D15cm%2CC%3D23%26ordm%3B%E2%91%A2a%3D49cm%2Cb%3D26cm%2CC%3D107%26ordm%3B%E2%91%A3a%3D31cm%2Cb%3D42cm%2Cc%3D27cm)
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