b^4-24b^3+72b^2+216b-2592=0
    （180-3x）x-（180-3x）20=900
    4×(1+0.0025x^2)=x^2×(1+0.025x^2)^2×(1+0.0004x^2)
    0.99x^2+80.0004x^4+1600.032x^6+0.64x^8-4=0
    -4.76x^2+0.2964x^4+0.011856x^6+0.000064x^8-36=0
    x+0.1x=6211
    0.04x^2+0.2964x^4+0.011856x^6+0.000064x^8-36=0
    x+213=0.8*270+0.8*x
    X＋7.5＝0.8（X－7.5＋X）
    0.04x^2+0.2964x^4+0.011856x^6+0.000064x^8-6=0
    x+258=x×0.88-30
    6×(1+0.16x^2)=x^2×(1+0.29x^2+0.01x^4)×(1+0.0064x^2)
    x=0.88*x-30
    0.01x^6+0.29x^4+x^2-36=0
    X(X-3)+X-3=0
    X^-4X
    X÷（X+669.868）=5%
    （X-5）(X+2)
    58.41=（（87.48-20）*exp（-x/4.01）+20 ）
    x^3-14x^2+81x+124=0

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