4m^2-9m+2设两个向量a=(x+2,x的平方--cosa的平方)和b=(m,m/2+sina)其中x,m,a为实数,若向量a=2b,则x/m的取值范围是?向量a=(x+2,x^2-(cosa)^2)和b=(m,m/2+sina)其中x,m,a为实数,若向量a=2b,则{x+2=2m,{x^2-(cosa)^2=m+2
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![4m^2-9m+2设两个向量a=(x+2,x的平方--cosa的平方)和b=(m,m/2+sina)其中x,m,a为实数,若向量a=2b,则x/m的取值范围是?向量a=(x+2,x^2-(cosa)^2)和b=(m,m/2+sina)其中x,m,a为实数,若向量a=2b,则{x+2=2m,{x^2-(cosa)^2=m+2](/uploads/image/z/5976146-2-6.jpg?t=4m%5E2-9m%2B2%E8%AE%BE%E4%B8%A4%E4%B8%AA%E5%90%91%E9%87%8Fa%3D%28x%2B2%2Cx%E7%9A%84%E5%B9%B3%E6%96%B9--cosa%E7%9A%84%E5%B9%B3%E6%96%B9%EF%BC%89%E5%92%8Cb%3D%28m%2Cm%2F2%2Bsina%29%E5%85%B6%E4%B8%ADx%2Cm%2Ca%E4%B8%BA%E5%AE%9E%E6%95%B0%EF%BC%8C%E8%8B%A5%E5%90%91%E9%87%8Fa%3D2b%EF%BC%8C%E5%88%99x%2Fm%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%3F%E5%90%91%E9%87%8Fa%3D%28x%2B2%2Cx%5E2-%28cosa%29%5E2%EF%BC%89%E5%92%8Cb%3D%28m%2Cm%2F2%2Bsina%29%E5%85%B6%E4%B8%ADx%2Cm%2Ca%E4%B8%BA%E5%AE%9E%E6%95%B0%EF%BC%8C%E8%8B%A5%E5%90%91%E9%87%8Fa%3D2b%2C%E5%88%99%7Bx%2B2%3D2m%2C%7Bx%5E2-%28cosa%29%5E2%3Dm%2B2)
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