已知函数:f(x)=x^2+bx+c,其中:0≤b≤4,0≤c≤4 (1)若a∈N,b∈N,求方程f(x)=0有负实根的概率已知函数:f(x)=x^2+bx+c,其中:0≤b≤4,0≤c≤4(1)若a∈N,b∈N,求方程f(x)=0有负实根的概率(2)记函数f(x

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