己知角a是第一象限角,则角a/2是( ) 为何是若k为偶数,令k=2n,n·360º<x/2<k·360º+90º,故n/2为第一象限.为何是若k为奇数,令k=2n+1,n·360º+180º<x/2<n·360º+270º,故a/2为
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![己知角a是第一象限角,则角a/2是( ) 为何是若k为偶数,令k=2n,n·360º<x/2<k·360º+90º,故n/2为第一象限.为何是若k为奇数,令k=2n+1,n·360º+180º<x/2<n·360º+270º,故a/2为](/uploads/image/z/10261991-47-1.jpg?t=%E5%B7%B1%E7%9F%A5%E8%A7%92a%E6%98%AF%E7%AC%AC%E4%B8%80%E8%B1%A1%E9%99%90%E8%A7%92%2C%E5%88%99%E8%A7%92a%EF%BC%8F2%E6%98%AF%28+%29+%E4%B8%BA%E4%BD%95%E6%98%AF%E8%8B%A5k%E4%B8%BA%E5%81%B6%E6%95%B0%2C%E4%BB%A4k%3D2n%2Cn%C2%B7360%26%23186%3B%EF%BC%9Cx%EF%BC%8F2%EF%BC%9Ck%C2%B7360%26%23186%3B%EF%BC%8B90%26%23186%3B%2C%E6%95%85n%EF%BC%8F2%E4%B8%BA%E7%AC%AC%E4%B8%80%E8%B1%A1%E9%99%90.%E4%B8%BA%E4%BD%95%E6%98%AF%E8%8B%A5k%E4%B8%BA%E5%A5%87%E6%95%B0%2C%E4%BB%A4k%3D2n%2B1%2Cn%C2%B7360%26%23186%3B%2B180%26%23186%3B%EF%BC%9Cx%EF%BC%8F2%EF%BC%9Cn%C2%B7360%26%23186%3B%2B270%26%23186%3B%2C%E6%95%85a%EF%BC%8F2%E4%B8%BA)
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