x-2= 1/2.56
    0.2=（x-15.5）/x
    0.1=（x-15.5）/x
    0.4=（x-15.5）/x
    0.3=（x-15.5）/x
    x^3+7x^2+16x+11＝0
    （tan(0.0385*x)）*（tan(0.0385*(40.75-x))） =1/2.56
    （tan(0.0385*x)）*（tan(0.0385*(40.75-x))） =2.56
    tan(0.0385*x)*tan(0.0385*(40.75-x)) =1/ 2.56
    tan(0.0385*x)*tan(0.0385*(40.75-x)) = 2.56
    tan(0.0385*x)*tan(0.0385*(40.75-x)) = 2.25
    tan(0.0385*x)*tan(0.0385*(40.75-x))=4
    tan(0.0353*21.2)*tan(0.0373*x)-0.79=0
    tan(0.0353*x)*tan(0.0373*(40.75-x))-0.79=0
    x=0.75(28-x)
    3x＋√3-1＝0
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=6000
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=10000
    (155+318)/31*x+155/31*(x+15)+124/31(x+30)=580
    (0.525x+2.16)/(1.7x+7.7)+3.3/(x+11)=0.385

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