3000*sin(30-x)=(6000*cos(x)-3000)/3
    2000*sin(30-x)=(4000*cos(x)-2000)/3
    1300*sin(30-x)=(2600*cos(x)-1300)/3
    6*sqrt(3-3*b^2)-(6-2600)*b+2600=0
    6*sqrt(3-3*b^2)-(6-2600)*b+2600=0
    6*sqrt(3-3*x^2)-(6-2600)*x+2600=0
    6*√(3-3*cosx^2)-(6-2600)*cosx+2600=0
    6*(√3-3*COSx^2)-(6-2600)*COSx+2600=0
    8000/(x+12.12)+10000/x+5500/x=150
    8000/(x+12.12)+10000/x+10000/x=150
    8000/(x+12.12)+10000/x+10000/x
    （38.13+13.7x+38.13)*(2*38.13+13.7x+38.13)/(228.78+41.1x)+41.22x=(70.25+70.25+45.65x)*(2*70.25+45.65x+70.25)/(421.5+45.65x)
    （38.13+13.7x+38.13)*(2*38.13+13.7x+38.13)/(228.78+41.1x)=(70.25+70.25+45.65x)*(2*70.25+45.65x+70.25)/(421.5+45.65x)
    120x = 100（x+4）+80
    100x = 120（x+4）+80
    100x = 120（x-4）-80
    100x = 120（x+4）-80
    100x = 120（x-4）+80
    100x = 120（x-4）-80
    100x=120（x-4）-80

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