10x²+530x=75,x等于几?

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10x²+530x=75,x等于几?10x²+530x=75,x等于几?10x²+530x=75,x等于几?x²+53x=7.5x²+53x+702.

10x²+530x=75,x等于几?
10x²+530x=75,x等于几?

10x²+530x=75,x等于几?
x²+53x=7.5
x²+53x+702.25=7.5+702.25
(x+26.5)²=709.75
x = -26.5±√2839/2