(x*(0.95*70+0.05*5)+(1-x)*0.8)*0.36+0.64=0.64+0.36*1.12/0.5
    x*(0.95*70+0.05*5)+(1-x)*0.8=5
    400/9.8+3-1=(((1+0.03*(20000/20))(10^4/20^4)+1+0.1)x^2)/(2*9.8)
    400000/9.8+3-1=(((1+0.03*(20000/20))(10^4/20^4)+1+0.1)x^2)/(2*9.8)
    50=sqrt(0.04*x^2+1)*sqrt(0.25*x^2+1)*sqrt(4*x^2+1)
    11.78x^3+122.535x^2+293.10x-495.18=0
    x-4.6^0.4=0
    （50-x)^0.75=0.434*(x-39)
    78705.2=30.29x+0.01872x^(2)
    0.05（830-x）-0.06x=3
    0.3*（k^0.4）=(0.02+0.1)k
    (5000×12×0.9-70%×124X×6.4%）÷（30%×124X+5%×124X）=3.8%
    400+28.4=(3001x^2)/313.6+(1.1x^2)/19.6
    d(1/6+1/4)=10/3
    2c/5=11/10-7/10
    400000+28.4=(3001x^2)/313.6+(1.1x^2)/19.6
    b(1+20%)=8.4
    8.5a=98-47
    400000+3*9.8=3001x^2
    -2^3+92^2+x=0

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