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About 2002 Hebei senior high school entrance examination mathematics 27 questions urgent! ! ! !
(1) monthly sales 500- 10*5=450 profit 10*450=4500.

(2)y =(X-40)* 500-(X-50)* 10 =- 10X？ +400 times

(3) When y=8000

8000=- 10x？ There is an error in +400X.

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