1/x*x+2x+3
    -arctanx-arctan(1/2)x-arctan(1/3)x=-90
    (1+0.01x^2)*(1+x^2)*(1+100x^2)=250000
    -atan(0.1x)-atanx-atan(10x)=-180
    0.0016x=0.0015-0.08x+5x²
    0.0016x＝0.0015-0.08x+x²
    xxx-3xx-18x-4=0
    sinx＝0.72
    x*3-x*（1/3）=88
    xxx+3x-4=0
    1.8665＝(0.285＋0.005x)*x∧1.5
    1.9＝(0.285＋0.005x)*x∧1.5
    1.8665＝（0.285＋0.005x)*x∧15
    （X-163720）/X=0.5 （X-207260）/X=0.5 （X-304220）/X=0.5 （X-219840）/X=0.5 （X-258940）/X=0.5
    （X-163720）/X=0.56508435 （X-163720）/X=0.55508435 （X-163720）/X=0.54508435
    (X-304220)/X=0.53499 (X-304220)/X=0.52499 (X-304220)/X=0.51499
    （X-304220）/304220=0.52499
    (X-304220)/304220=0.53499
    （3282.2-0.669836x×x）/(0.06645648x+199.6208)＝(9050－x)/0.8592
    （3282.2-0.669836x×x）/0.06645648x+199.6208＝(9050－x)/0.8592

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