why the gain is wrong in this close loop?

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shanmei

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From the two inputs, we know the difference voltage is Vin-Vout, after amplifying A, Vout=(Vin-Vout)*A, Vout(1+A)= Vin, so Vout/Vin=1/(1+A). When A is infinite, Vout/Vin=0? it is wrong , why? Thanks.
 

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