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您好，双电电源放大器做电压跟随器，当供电分别为+12V和-12V、 +12V和-5V、 正12V和0V、 正12V和6V，输入电压为+8V时候，输出电压是多少呢？输出电压的参考地是正负电源和的一半吗？
如果作为正比例运算放大器，下图输出电压应该是多少呢？
