x^2÷（0.05－x）＝10^－5
    （539+x）/(614+x)=0.9
    14.4x=2^(x+1)-1
    48.00=X/(100+X)*100%
    32.00=X/(100+X)*100%
    48.00=X/(100+X)*100%
    50.74=X/(100+X)*100%
    50.73891626=X/(100+X)*100%
    50.7389=X/(100+X)*100%
    X/(100+X)*100%=0.573
    45%X / (100+X)=0.45
    45%X / (100+X)
    45% x/(100+x)
    cosx=0.703
    x^3+7x^2-12x+14=0
    x^3=2.8
    (185+403)/31*x+172.5/31*(x+15)+93/31*(x+30)=1720
    x*13%+(13664.066-x)*9%=1578.934
    X=1700*0.1/(3.4*0.000001*50000*16)
    X=770*0.1/(10.26*0.000001*7500*8)

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