p+50%/p-50%=3
    0.28x2+72x-2406.98=0
    1000*(x/(1.4078-x))+500*(x/(4.3200-x))+200*（x*10000/(14655.0000-x*10000))+((3.00-1.50)*1+(2.00-1.25)*1+(3.00-1.50)*1)-34.19>=0
    4e/5-3/10=9/5
    （39-x)/(sqrt(((38.7-x)/0.019)^2+10000)=0.005
    1000*(x/(1.4078-x))+500*(x/(4.3200-x))+200*（x*10000/(14655.0000-x*10000))-34.19-4.25>=0
    2（x－2）－3（4x－1）=9（x－1）
    2(h-55%)/3=40%
    2u-102%=66%
    k-1.62/5=0.12
    2b/9+1/3=1/2
    18(x-2)=270
    31600+9600000/Q+15Q
    7/10(5/3+h)=7/4
    2(n+5)/3=6
    (p+7)×20%=2
    5b/6-2.7=2.3
    6j+5=47
    （1050×12-70%×60x×7.2%）÷（30%×60x+2%×60x）
    （1050x12-70%x 60Xx7.2%）÷(30%x60X+2%x60X)

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