13%=5x+5x^2
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13%=5x+5x^2
13%=5x+5x^2
13%=5x+5x^2
![13%=5x+5x^2](/uploads/image/z/19846103-23-3.jpg?t=13%25%3D5x%2B5x%5E2)
两边除以5
x²+x=0.026
x²+x+1/4=0.026+1/4
(x+1/2)²=69/250
x+1/2=±√690/50
x=(-25-√690)/50,x=(-25+√690)/50
x²+x=0.026
x²+x+1/4=0.026+1/4
(x+1/2)²=69/250
x+1/2=±√690/50
x=(-25-√690)/50,x=(-25+√690)/50
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5[x^2-x]=3[x^2+x]