（12.25*17.89+24.99*14.11+27.87*x）/65.11=11.95
    x^3-12x^2+21x-10 = 0
    100000*(x*0.0001/(1.4128-x*0.0001))+500000*(x*0.0001/(4.3250-x*0.0001))+200000*（x/(14675.0000-x))+63.75-41.93>=0
    （12.25*17.89+24.99*x）/37.24=15.35
    1/(200+x)-1/(140+x)=1/x
    1.6X减0.2x等于0.42
    x^3-12x^2+21x-40 = 0
    30.07x+0.023x^(2)=89569
    1/(200+x)-1/(20+x)=1/x
    30.07+0.023x=89569/x
    x^3-12x^2+25x-40=0
    x除以0.8减0.75等于0.75
    (x-6000×6%)×(1-25%)/(3000+600)=(x-6000×6%-2400×8%)×(1-25%)/3000
    －6x≤7
    x^2+0.01x-4.245＝0
    －2x≤－10
    －2X<－10
    x^(2)-25x+325=0
    2.25x<50+2x
    84532=29.98x+0.0216x^(2)

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