a=arccos0.5
    0.5=cosa
    √x-1
    100000/（0.8x+5x+10x0)
    x^9+((-5)-19)*x^8+(16*5+153)*x^7+((-106*5)-680)*x^6+(376*5+1820)*x^5+((-771*5)-3001)*x^4+(920*5+2985)*x^3+((-610*5)-1660)*x^2+(200*5+425)*x-25*5-25=0
    （26.807+x）×0.85＝53.614+70.221-x
    （26.807+x）×0.85＝53.614+71.221-x
    （26.807+x）×0.85＝53.614+72.221-x
    （26.807+x）×0.85＝53.614+73.221-x
    （26.807+x）×0.85＝53.614+69.221-x
    (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

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