三角形abc中,若角a+角b=2角c,则三角形abc是?A.锐角三角形B.钝角三角形C.直角三角形D.不能确定计算(2+1)(2^2+1)(2^4+1).(2^2n+1)=?A.4^2n-1B.2^2n-1C.2^4n+1D.2^n-1
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![三角形abc中,若角a+角b=2角c,则三角形abc是?A.锐角三角形B.钝角三角形C.直角三角形D.不能确定计算(2+1)(2^2+1)(2^4+1).(2^2n+1)=?A.4^2n-1B.2^2n-1C.2^4n+1D.2^n-1](/uploads/image/z/6932596-4-6.jpg?t=%E4%B8%89%E8%A7%92%E5%BD%A2abc%E4%B8%AD%2C%E8%8B%A5%E8%A7%92a%2B%E8%A7%92b%3D2%E8%A7%92c%2C%E5%88%99%E4%B8%89%E8%A7%92%E5%BD%A2abc%E6%98%AF%3FA.%E9%94%90%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2B.%E9%92%9D%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2C.%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2D.%E4%B8%8D%E8%83%BD%E7%A1%AE%E5%AE%9A%E8%AE%A1%E7%AE%97%EF%BC%882%2B1%EF%BC%89%EF%BC%882%5E2%2B1%EF%BC%89%282%5E4%2B1%29.%282%5E2n%2B1%29%3D%3FA.4%5E2n-1B.2%5E2n-1C.2%5E4n%2B1D.2%5En-1)
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