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
    （1.5X+61820.5）*0.35/(1.7X+77608.5)+33260.8/(X+110869.485)=0.385
    (15-x)/100000=x/22000+(x-0.8)/102000
    (15-x)/100000=x/22000+(x-0.8)/10.20
    (1+x)^2-1=10.25%
    299/31*x+229.5/31*(x+15)+93/31(x+30)=911
    (x-0.02x)-((x-0.02x)-0.02*(x-0.02x))=10
    5000=x-x*40%*1.05
    （0.28*（Y+47515.7）+0.35Y+0.615*110869.485-0.035*47010.88）/（Y+47515.7+110869.485）+（0.05Y+0.05*110869.485）/（Y+47515.7+Y+110869.485）=0.42
     5000=X-X*0.4*1.05
    X^-114 X+3200
    （x+4.8）*（x+4.8）=6.4*6.4+x*x

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