1000x-20x平方-500x=2700

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1000x-20x平方-500x=27001000x-20x平方-500x=27001000x-20x平方-500x=27001000x-20x^2-500x=2700500x-20x^2=27002

1000x-20x平方-500x=2700
1000x-20x平方-500x=2700

1000x-20x平方-500x=2700
1000x-20x^2-500x=2700
500x-20x^2=2700
25x-x^2=135
x^2-25x+135=0
(x-25/2)^2=85/4
x=(25±√85)/2

除以20
x²-25x+135=0
x=(25±√85)/2