在三角形ABC中,设a+c=2b,A-C=60度,求sinB的值根据正弦定理 a/sinA=b/sinB=c/sinC得:a=(sinA/sinB)*b c=(sinC/sinB)*b将其带入已知条件 a+c=2b中可得sinA+sinC=2sinB根据三角函数和公式sinA+sinC=2sin[(A+C
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 13:29:07
![在三角形ABC中,设a+c=2b,A-C=60度,求sinB的值根据正弦定理 a/sinA=b/sinB=c/sinC得:a=(sinA/sinB)*b c=(sinC/sinB)*b将其带入已知条件 a+c=2b中可得sinA+sinC=2sinB根据三角函数和公式sinA+sinC=2sin[(A+C](/uploads/image/z/1684702-46-2.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%AE%BEa%2Bc%3D2b%2CA-C%3D60%E5%BA%A6%2C%E6%B1%82sinB%E7%9A%84%E5%80%BC%E6%A0%B9%E6%8D%AE%E6%AD%A3%E5%BC%A6%E5%AE%9A%E7%90%86+a%2FsinA%EF%BC%9Db%2FsinB%EF%BC%9Dc%2FsinC%E5%BE%97%EF%BC%9Aa%EF%BC%9D%EF%BC%88sinA%2FsinB%EF%BC%89%2Ab++c%EF%BC%9D%EF%BC%88sinC%2FsinB%29%2Ab%E5%B0%86%E5%85%B6%E5%B8%A6%E5%85%A5%E5%B7%B2%E7%9F%A5%E6%9D%A1%E4%BB%B6+a%2Bc%EF%BC%9D2b%E4%B8%AD%E5%8F%AF%E5%BE%97sinA%2BsinC%EF%BC%9D2sinB%E6%A0%B9%E6%8D%AE%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E5%92%8C%E5%85%AC%E5%BC%8FsinA%2BsinC%EF%BC%9D2sin%5B%28A%2BC)
xSN@YƱ-WYtA ۟F,ԼhZZR+$.!&;6B̸DJ]U9{3z8l-94L+J:۲[,8Zŗ/Wzͪ߁+a@G0h'jmL==L|a$jۈ'QQ2w3N7KykPЇj?]w. V삃fLLf̢EUY3ZP=hs3dKwִj>c"3!0
A\<./^