x=0.88x-30+258
    10000×(1+0.0625x^2)=x^4×(1+0.0001x^2)
    -12x²＋80x＋30=0
    （180-3x）x-（180-3x）20=1500
    36×(1+0.16x^2)=x^2×(1+0.04x^2)×(1+0.25x^2)×(1+0.0064x^2)
    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

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