2a^3-a-3=0
    2x^4-8x+3=0
    46-(x-12)=2
    (1+r)^4=1.3
    (1+r)^3=1.3
    (1+r)^2=1.2
    (1+r)^3=1.2
    （1+r）^5=1.4
    （1+r）^2=1.4
    （1+r）^3=1.4
    (X-6160)*(1-25%)/7000=[(X-5440)*(1-25%)-3000]/5000
    (X-180)*(1-25%)/1500=(X-180-4000*8%)*(1-25%)/1000
    0.7=(1.022+n×0.995)/(1+n)
    （1+r）^4=1.2
    0.7=(1×1+n×0.995)/(1+n)
    （1+r）^3=1.2
    0.7=(1×1+n×0.995)/1+n
    0.7=(1×1.022+n×0.995)/1+n
    （1600÷s^2÷(0.04*s^2+1)÷(0.0625^2*s^2+1)）^0.5=1
    0.7=(1×10.97+n×9.95)/(1+n)

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