(1+x)^365=2.5
    x^2-280x+2025=0
    x²-12x-8
    x^2-386.5x+2025=0
    （X-180）*0.75/2400 = ((X-180)*0.75-300)/2000
    x^2-400x+2025=0
    x^2-152.5x+2025=0
    x^2-146.5x+2025=0
    25=50×3.302×0.0001×X^2+1250÷3×（3.302×0.0001）^3×X^4
    28=50×3.302×0.0001×X^2+1250÷3×（3.302×0.0001）^3×X^4
    30=50×3.302×0.0001×X^2+1250÷3×（3.302×0.0001）^3×X^4
    4x-8=3x+3
    X*10%+X=688
    X*10%+X=572
    x*0.79*3.79*1.05=2.82
    x*0.41*3.79*1.05=1.46
    x×(1.31+x)=1.8×10^(-5)×(0.2-x)
    x(1.31+x)=1.8×10^(-5)×(0.2-x)
    x+x÷11.3=30
    x+x÷11.3=30

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