已知向量a=(mx,8),b=(2x+2,-x),c=(1,0),函数f(x)=a·b+1,g(x)=a·c,若对于任意实数x,f(x)和g(x)的值至少有一个为正数,则实数m的取值范围是()A(0,4] B(0,2) C(0,8) D(2,8)
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![已知向量a=(mx,8),b=(2x+2,-x),c=(1,0),函数f(x)=a·b+1,g(x)=a·c,若对于任意实数x,f(x)和g(x)的值至少有一个为正数,则实数m的取值范围是()A(0,4] B(0,2) C(0,8) D(2,8)](/uploads/image/z/6834639-39-9.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%28mx%2C8%29%2Cb%3D%282x%2B2%2C-x%29%2Cc%3D%281%2C0%29%2C%E5%87%BD%E6%95%B0f%28x%29%3Da%C2%B7b%2B1%2Cg%28x%29%3Da%C2%B7c%2C%E8%8B%A5%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8F%E5%AE%9E%E6%95%B0x%2Cf%EF%BC%88x%EF%BC%89%E5%92%8Cg%EF%BC%88x%EF%BC%89%E7%9A%84%E5%80%BC%E8%87%B3%E5%B0%91%E6%9C%89%E4%B8%80%E4%B8%AA%E4%B8%BA%E6%AD%A3%E6%95%B0%2C%E5%88%99%E5%AE%9E%E6%95%B0m%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%EF%BC%88%EF%BC%89A%EF%BC%880%2C4%5D+B%280%2C2%29+C%280%2C8%29+D%282%2C8%29)
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