0.495*X=0
    -0.18+0.495*x=0
    80x-50(10-x)=620
    9÷(X+6)=0.6
    X*0.375+(1-x)*(-0.12)=0.06
    X*0.375+X=0.06
    X*0.375+(1-x)*(-0.12)=0.06
     X0.375+1-x*-0.12=0.06
    X*0.375+(1-x)*(-0.12)=0.06
    X*0.375+x*-0.12=0.06
     0.255X=0.06
    12/x-12/(x+2)=3
    -0.06x^2+1.1478x-5.134=0
    -0.0612x^2+1.1634x-5.1826=0
    xx+420x-108000=14000
    （x×x）+420x-1228000=0
    -0.0636x^2+1.188x-5.2532=0
    -0.0648x^2+1.2072x-5.3096=0
    -0.066x^2+1.2234x-5.3618=0
    -0.0672x^2+1.2372x-5.4028=0

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