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Zhang Deran Pian Junsheng Cheng Xiangyang Ma Min Dept. of Maths; Fuyang Teachers College; Fuyang 236032; 阜陽師範(fàn)學(xué)院數(shù)學(xué)系;阜陽師範(fàn)學(xué)院數(shù)學(xué)系阜陽;