1.△ABC中sina+sinc=p*sinc ac=1\4 bˆ2,若B为锐角,求P的范围sina+sinc=p*sinb ac=1\4 bˆ2,打错了.
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![1.△ABC中sina+sinc=p*sinc ac=1\4 bˆ2,若B为锐角,求P的范围sina+sinc=p*sinb ac=1\4 bˆ2,打错了.](/uploads/image/z/6801765-69-5.jpg?t=1.%E2%96%B3ABC%E4%B8%ADsina%2Bsinc%3Dp%2Asinc+ac%3D1%5C4+b%26%23710%3B2%2C%E8%8B%A5B%E4%B8%BA%E9%94%90%E8%A7%92%2C%E6%B1%82P%E7%9A%84%E8%8C%83%E5%9B%B4sina%2Bsinc%3Dp%2Asinb+ac%3D1%5C4+b%26%23710%3B2%EF%BC%8C%E6%89%93%E9%94%99%E4%BA%86.)
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1.△ABC中sina+sinc=p*sinc ac=1\4 bˆ2,若B为锐角,求P的范围sina+sinc=p*sinb ac=1\4 bˆ2,打错了.
1.△ABC中sina+sinc=p*sinc ac=1\4 bˆ2,若B为锐角,求P的范围
sina+sinc=p*sinb ac=1\4 bˆ2,打错了.
1.△ABC中sina+sinc=p*sinc ac=1\4 bˆ2,若B为锐角,求P的范围sina+sinc=p*sinb ac=1\4 bˆ2,打错了.
p=(sinA+sinC)/sinB=(a+c)/b=(a+c)/2√ac>=1
cosB=(a^2+c^2-b^2)/2ac
B为锐角,0
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