1 在△ABC中,AD垂直BC于点D,BD/DC=7/4,tanB=2/3,求tanC 2 已知:△ABC中,AB=AC=5 ,BC=4,BD垂直AC于点D1)求tan∠ABC2)求BD3 △ABC中,∠A=90°,AB=AC,D为AC上一点,且AD:DC=1:21)求∠ADB的正弦、余弦、正切的值2)求∠DBC
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![1 在△ABC中,AD垂直BC于点D,BD/DC=7/4,tanB=2/3,求tanC 2 已知:△ABC中,AB=AC=5 ,BC=4,BD垂直AC于点D1)求tan∠ABC2)求BD3 △ABC中,∠A=90°,AB=AC,D为AC上一点,且AD:DC=1:21)求∠ADB的正弦、余弦、正切的值2)求∠DBC](/uploads/image/z/14738866-34-6.jpg?t=1+%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAD%E5%9E%82%E7%9B%B4BC%E4%BA%8E%E7%82%B9D%2CBD%2FDC%3D7%2F4%2CtanB%3D2%2F3%2C%E6%B1%82tanC+2+%E5%B7%B2%E7%9F%A5%EF%BC%9A%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%3D5+%2CBC%3D4%2CBD%E5%9E%82%E7%9B%B4AC%E4%BA%8E%E7%82%B9D1%EF%BC%89%E6%B1%82tan%E2%88%A0ABC2%EF%BC%89%E6%B1%82BD3+%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0A%3D90%C2%B0%2CAB%3DAC%2CD%E4%B8%BAAC%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E4%B8%94AD%3ADC%3D1%3A21%29%E6%B1%82%E2%88%A0ADB%E7%9A%84%E6%AD%A3%E5%BC%A6%E3%80%81%E4%BD%99%E5%BC%A6%E3%80%81%E6%AD%A3%E5%88%87%E7%9A%84%E5%80%BC2%29%E6%B1%82%E2%88%A0DBC)
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