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运放输入电压被拉低?

我通过一个LDO产生2.5V,然后输入到一个运放(同相比例放大器,放大倍数1.35),运放的输出如果不接负载,输出是正确的3.3V。如果接上负载,同相输入电压就会变成2V,请问这是什么原因