0.1*x+20=130/1000*x
    X=2185309-0.2565X
    x^2-5.7x+6.6=0
    5000000×79＝3000000x
    500×79＝300x
    1/x -x =1/2
    (x-129.320)*10-2=1
    5x=（20-5）*45
    1.45=120/（120-x）
    1.45=120/120-x
    (X-X/1.09*0.03)*0.02=49518.54
    (X-X/1.09*0.03)*0.02=212808.62
    (X-X/1.09*0.03)*0.02=129644.44
    x^2-14.8x+52.2=0
    200=x^2*sqrt(x^2+1)*sqrt(100x^2+1)
    X^5+10X^3+20X-4=0
    X^（5）+10X^（3）+20X-4=0
    a^2=-455
    x^3+x=6
    26700+X-X*2.5%=50000

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