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
    1.43*1.2*(2400+346)*113.8%*794/(794+x-45) = 2502
    4x/x-1
    1.25*1.2*(2400+346)*113.8%*794/(794+x-45) = 2502
    (2400+346)*113.8%*794/(794+x-45)=2502
    X×X×X×2=8
    sqrt[(x+3)^2+4^2]=x
    -x^3+10x^2-22x+10=0
    3-√3x-1+√(4-√3x)
    2*m*m+m=0
    2*m*m+3*m-2=0
    x^3—11x^2+28x+1
    4x+2=18
    24/x²+12
    30+0.1x=0.15x
    arctanx+arctan10x＝90

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