56x-40x-580-（56x-5）*0.13*0.12=0
    x^3+6x^2+11x+11=0
    r^2+6r+9=0
    r^2-2r-2=0
    r^2-2r+2=0
    t^2=12t-50
    4:240=x:900
    (D+84)*D*0.12566=1200
    6t-1/2t^2-25=0
    r^2-2r=2
    r^2-2r=0
    900/x＋150＝900/2.5x
    2.51/(x*0.1)+0.00005679/3.7=0.00001
    24*（2.5+0.5t）=（24-1/t）*(2.5+t)
    1/0.1=-2*lg（2.51/(x*0.1)+0.00005679/3.7）
    x2-36x+36=0
    549/2r=sin(276/r)
    0.21=x+(x-0.0781)*1.025
    80:6=x:2
    x2-60x+36=0

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