(x^7+((-2)-15)*x^6+(12*2+90)*x^5+((-55*2)-275)*x^4+(120*2+449)*x^3+((-127*2)-371)*x^2+(60*2+126)*x-10*2-8)=0
    -arctanx-arctan(x/50)=-90
    0.5x/(sqrt(2)*sqrt(5/4))=3.14/2
    arctan0.5x-90-arctan2x-arctan0.05x=-180
    -57.3x-90-arctan1-arctan0.5=-180
    -57.3x-90-arctan1-arctan0.5
    （15÷h）²=2×9.807（5-h）+9
    （15÷h）²=2×9.807（5-h）+2.8×2.8
    2s^3+17s^2+28s-15=0
    arctan0.1x-arctan2x-arctanx = 90
    arctan0.1x-arctan2x-arctanx = -90
    arctan0.1x-arctan2x-arctanx=-90
    x^2（0.25x^2+1）=400
    55.32*4/t=0.11*1.01*4.2474*100000000/(8.314*303*98.86*5)
    55.55*4/t=0.1*1.01*3.1684*100000000/（8.314*298*99.4*7）
    x=21745.81+x*0.0003+x*0.06/1.06+x*0.06*0.11/1.06
    （4+x^2）^0.5+（25+x^2）^0.5-7=5.474
    （101.325+x）*4*x^2=1000000/919750
    （101.325+x）*4*x^=1000000/919750
    25+x＝33.69+152.152-x

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