x^3+4x^2+5x+3=0
    x=18/16*2/3
    （X+3）÷0.87+3=1.5x
    cos(x)+cos(360x)＝2
    1×14.3×700×32.63=360×x
    143.27×10^6=1×14.3×700×x×(455-x/2)
    (6 -X)²= x+2²
    1/n²
    1/n²
    X=120（1-0.75*0.8）
    (20-x)*0.3=x
    (20-x)*0.2=x
    3/(x*sqrt(x^2+1)*sqrt(1+0.25x^2))=1
    100+(24/25)x^2-x^3=0
    s^2+24s+100=0
    x(x^2+24x+100)=(x+25)(3x^2+48x+100)
    （0.1-x）(1-x)/x=1.75*10^(-5)
    6（x－10）＋15＝2（x＋5）＋25
    sin(18.19635x)=14.87025x
    sin(18.19635x)=15.3766x

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