0.0022385*(e)^(-101.086*x)=1.0022385-0.226*x
    4639.05×1.1=
    1.35×1.1×276.12×10
    (1.35×1.1×276.12×8)/(sin45)
    -x^3-8x^2-2x+52=0
    -x^3-8x^3-2x+52=0
    254.9+13.66x^2+118.47x=6.1305x^2+130.45x+527.34
    19x^4-72x^3+198x^2-216x+243=0
    x-147.83+24.51*x^(2/3)=0
    254.9+13.66x^2+118.47x=6.1305x^2+130.45x+982.21
    （5000*12*0.9-70%*130x*6.4%)/(30%*130x+5%*130x)=3.8%
    （5000*12*0.9-70%*130x*6.4%)/(30%*130+5%*130x)=3.8%
    x^3-16x-7
    （5000*12*0.9-70%*130x*6.4%)/(30*130+5%*130x)=3.8%
    8472*（e(-0.1155*x)-e(-0.1386*x)）=200
    X+3>=2-x 3(x-1)+1<2(x+1)
    [(1+i)^5-1]/[i*(1+i)^5] =1000/300
    X+3>=2-x
    x^2+x=240
    [(1+i)^5-1]/[i*(1+i)^5] =2

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