arctan(25x/1+25x)-45=arctan(250/251)
    (22+40x)*40*(1+2x)=100
    x ²+x-8=0
    x^2=-1
    ix=1
    (x^2-x-1)^(x+2)=1
    90-(x+5)-4=74
    x/(X+10)=84.85%
    x/(X+11)=84.85%
    x/(X+12)=83.33%
    x/(X+14)=83.33%
    x/0.09+(561974.92-x)/0.13=5781671.51
    X/(X+15)=77.94%
    x^4+4x^2=100
    8x-8=4x+4
    x=1.077×9.8×9.3×10-2×4.4×10-2/[(4×3.141592)×44.37×10-2]×0.6962
    8x-8=4x-4
    1.1^x=5
    （25.759+x）×0.85＝51.519+67.078-x
    （25.759+x）×0.85＝51.519+68.078-x

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