x^2-15.5x+58.7 = 0
    x^2-15.5x+57.8＝0
    x^2-15.2x+57.8＝0
    (x+2−3)*2*0.85=40
    (x+2−3)*2*0.32*0.85=40
    x*sqrt(1-x^2)+x*arcsinx-0.5*3.14159=0
    （1+2Y)(1-2Y)=
    110/（x-280）=2.2
    110/（x280）=2.2
    4.100=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    20006-（（20006-x）*0.05+x）=9573.15
    x*2500+x*3000/2500*1000=528430
    x*2500+x/2500*1000=528430
    (X-40)(200-2X)＝1350
    X/4600=2/3
    3X=5600/2
    3X=5600
    -5t^2+12t＝2
    5t^2+12t＝2
    25+x＝33.13+150.556-x

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