A. f1（x）f′2（x）-f2（x）f′1（x）=0
B. f1（x）f′2（x）-f2（x）f′1（x）≠0
C. f1（x）f′2（x）+f2（x）f′1（x）=0
D. f1（x）f′2（x）+f2（x）f′1（x）≠0
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