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运算放大器LM358输入电压的问题

Other Parts Discussed in Thread: LM358

我LM358单电源7V供电。同相输入端输入8V,反向输入端输入7.5V。做减法器想让他输出0.5V。请问这样是否可行?因为压差是0.5V,但是输入电压(7.5V和8.5V)都大于电源电压7V