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设集合A={0,1,2,3},如果方程x2-mx-n=0(m,n∈A)至少有一个...
设集合A={0,1,2,3},如果方程x2-mx-n=0(m,n∈A)至少有一个根x∈A,就称该方程为合格方程,则合格方程的个数为( )
A.7
B.8
C.9
D.10
考点分析:
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