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
    X+(X*9%)=387867.59
    (180+267)/31*x+221.5/31*(x+15)+124/31(x+30)=934
    6(5.5-4+12-p+7)+10=4*(5.5-4)+10*12*0.9-10p+10*7*0.9
    62x=1
    （x-1.007）*200-0.1=2
    （3598-X）/3598=0.25
    -1/5（x-4）^2+21/5=1.55
    K=2204+66.12+0.01K+40.44+0.0002K+462.11+0.0020K+0.0538K
    10t-（5/2）t^2=0
    3^x=x^3
    (1+1/x)^(1+x)=3
    5400/（x+10）=3*（1600/x）
    3x^2-2x-1=0
    x^2-28x+180=0
    10+（t-5）+8+2（t-8）＝26

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