arctan2x-arctan0.5x-arctan0.2x
    arctan0.2x=arctan0.025x+arctan0.006x
    -5x^2+100x+60000=60400
    1x/10=1.1x
    x+4÷x
    x=2(x-2)^2
    x-2=2(x-2)^2-x
    x=2(x-2)^2
    3.77（0.09-x）(0. 16-x)=0. 0154x
    x²－28x＋18＝0
    x²－28x＋18＝0
    (0.0165x^4-0.633x^2)^2+(x-0.0698x^3)^2=(3.3x)^2+100
    80/1000*3.7*3600=55.5/1000000*x+0.5/1000000*1.5*(2*365*24*3600-x*4/1000)
    x^3-3x+1=0
    80*x=160
    x=x+1
    0.36x^4+(x-0.05x^3)^2=100
    -592091500x^2+124248770x+320174410=0
    (180x)^2+324=(100x^4-604x^2)^2+(6x-401x^3)^2
    16*x*x*x-8*x*x+x-9=0

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