已知向量m=(-1,sinx),n=(-2,cosx),函数f(x)2mn(2)若三角形abc的角a,b所对的边分别为a,b,f(a/2)=24/5,f(b/2+π/2)=64/13,a+b=11,求a的值
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![已知向量m=(-1,sinx),n=(-2,cosx),函数f(x)2mn(2)若三角形abc的角a,b所对的边分别为a,b,f(a/2)=24/5,f(b/2+π/2)=64/13,a+b=11,求a的值](/uploads/image/z/2624118-6-8.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fm%3D%28-1%2Csinx%29%2Cn%3D%28-2%2Ccosx%29%2C%E5%87%BD%E6%95%B0f%28x%292mn%EF%BC%882%EF%BC%89%E8%8B%A5%E4%B8%89%E8%A7%92%E5%BD%A2abc%E7%9A%84%E8%A7%92a%2Cb%E6%89%80%E5%AF%B9%E7%9A%84%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BAa%2Cb%2Cf%28a%2F2%29%3D24%2F5%2Cf%28b%2F2%2B%CF%80%2F2%29%3D64%2F13%2Ca%2Bb%3D11%2C%E6%B1%82a%E7%9A%84%E5%80%BC)
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已知向量m=(-1,sinx),n=(-2,cosx),函数f(x)2mn(2)若三角形abc的角a,b所对的边分别为a,b,f(a/2)=24/5,f(b/2+π/2)=64/13,a+b=11,求a的值
已知向量m=(-1,sinx),n=(-2,cosx),函数f(x)2mn
(2)若三角形abc的角a,b所对的边分别为a,b,f(a/2)=24/5,f(b/2+π/2)=64/13,a+b=11,求a的值
已知向量m=(-1,sinx),n=(-2,cosx),函数f(x)2mn(2)若三角形abc的角a,b所对的边分别为a,b,f(a/2)=24/5,f(b/2+π/2)=64/13,a+b=11,求a的值
a=1 b=2 c=3 设数做吧