π-arccos（0.456）/（2.5x0.6）
    1.07X^2+891X+900000＝0
    3x^2-4x-455=0
    x^-1/2
    x∧5*18000=28000
    3X²+2X-3=0
    6x²+3x-36405603=0
    6x²+3x-6.3=36405596.7
    6x²+3x-6.3=36405596.7
    6x²+3x-6.3=36405596.7
    2X^-25X = 300
    -8.314×600×㏑（x）=61.9
    -8.314×800×㏑（x）=61.9
    84.1 = 33.515ln(x) - 4.3775
    -8.314×800×0.0001×㏑（x）=27.5
    50 = 33.515ln(x) - 4.3775
    -8.314×800×0.0001×㏑（x）=27.5
    -8.314×800×㏑（x）=27.5
    84.1 = 34.199ln(x) - 4.4098
    a+3×a×5%=34500

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