0.0000287/0.0000187=0.0833^x/0.0417x
    -6x^3-13x^2-12x-3
    x^1/3
    1.535=4.16^x
    1.535=0.0416^x
    （10+x）（200 －10x）=2160
    (X-25)/X=0.3
    70×7.94+11.95x=（70+x）×7.98
    e^x+1/e^x
    0.98*ln(100/120-x)=1
    0.000004x^3-0.0008x+1=0
    2405*56.2%*1.25*1.2*794/（794+x-18）=932
    2681*113.8%*1.25*1.2*794/（794+x-45）=2136
    2405*56.2%*1.25*0.8*794/（794+x-18）=932
    2405*56.2%*1.25*0.8*0.5*794/（794+x-18）=466
    2405*56.2%*1.25*0.8*0.5*（794+x-18）=466
    1.43*1.2*(2400+346)*113.8%*794/(794+x-45)=2502
    1.43*1.2*(2400+346)*113.8%*794/(794+x-45) = 2502
    1.43*1.2*(2400+346)*113.8%*794/(794+x-45) = 2502
    1.43*1.2*(2400+346)*113.8%*794/(794+x-45) = 2502

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