x^2/（100-2*x）=31.2
    (X-X/1.09*0.03)*0.02=162053.71
    (X-X/1.09*0.03)*0.02=77737.69
    0.5*0.5*0.5*0.5x=64
    arctanx+arctan(x/2)=270
    sqrt(7)*2x=4
    x^2/（100-2*x）=31.32
    X-0.006X=189
    (√5+2)^x+(√-2)^x=18
    （√5+2）^x+（√-2）^x=18
    （√5+2）^x+（√5-2）^x=18
    x^2-14.2x+46.8=0
    x^2-4x-12=0
    [x-（1/x）]^3
    （X-1/X）^3
    297X=280+150X
     3.6=81x+9
    0.28x=0.26
    x(1-x)=2x-2
    x^2+4x-2=0

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