设全集U=R,集合M={m|方程mx^2-x-1=0有实数根},N={方程x^2-x+n=0有实数根},求(CuM)∩N.

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设全集U=R,集合M={m|方程mx^2-x-1=0有实数根},N={方程x^2-x+n=0有实数根},求(CuM)∩N.
设全集U=R,集合M={m|方程mx^2-x-1=0有实数根},N={方程x^2-x+n=0有实数根},求(CuM)∩N.

设全集U=R,集合M={m|方程mx^2-x-1=0有实数根},N={方程x^2-x+n=0有实数根},求(CuM)∩N.
方程mx^2-x-1=0有实数根 1-4*m*(-1)=1+4m>=0 m>=-1/4
1-4*1*n>=0 n