(3000-x)*(x-1000)=800求解

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(3000-x)*(x-1000)=800求解

(3000-x)*(x-1000)=800求解
(3000-x)*(x-1000)=800求解

(3000-x)*(x-1000)=800求解
x^2-2000x+3000000+800=0
4000000-12003200