1.复数z=(x-2)+yi(x,y∈R)在复平面内对应向量的模为2,则|z+2|的最大值为()A.2 B.4 C.6 D.82.已知二次函数f(x)=ax²+bx+c的导数为f'(x),f'(0)>0,对于任意实数x都有f(x)≥0,则f'(0)/f(1)的最大值为_____.3.已
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![1.复数z=(x-2)+yi(x,y∈R)在复平面内对应向量的模为2,则|z+2|的最大值为()A.2 B.4 C.6 D.82.已知二次函数f(x)=ax²+bx+c的导数为f'(x),f'(0)>0,对于任意实数x都有f(x)≥0,则f'(0)/f(1)的最大值为_____.3.已](/uploads/image/z/10282304-56-4.jpg?t=1.%E5%A4%8D%E6%95%B0z%3D%EF%BC%88x-2%29%2Byi%28x%2Cy%E2%88%88R%29%E5%9C%A8%E5%A4%8D%E5%B9%B3%E9%9D%A2%E5%86%85%E5%AF%B9%E5%BA%94%E5%90%91%E9%87%8F%E7%9A%84%E6%A8%A1%E4%B8%BA2%2C%E5%88%99%7Cz%2B2%7C%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA%EF%BC%88%EF%BC%89A.2+B.4+C.6+D.82.%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0f%28x%29%3Dax%26%23178%3B%2Bbx%2Bc%E7%9A%84%E5%AF%BC%E6%95%B0%E4%B8%BAf%27%28x%29%2Cf%27%280%29%EF%BC%9E0%2C%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8F%E5%AE%9E%E6%95%B0x%E9%83%BD%E6%9C%89f%28x%29%E2%89%A50%2C%E5%88%99f%27%280%29%2Ff%281%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA_____.3.%E5%B7%B2)
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