x*1.09^30/0.06*(1-(1.03/1.09)^30) = 2000000
    x*1.09^30/0.06*(1-(1.09/1.03)^30)=2000000
    272000÷17500=[1-(1+x)^(-360)]÷x
    4200*3.8*x/532000=0.6
    30=50*（6x）^(1/6)*(2x+6)^(-1/6)*6x*(6x/(2x+6)*0.001)^(1/2)
    8a^2-a-2=0
    (1-x)^2*(4-x)-104+24*x=0
    272000=17500*[(1-(1+x)^(-360))÷x]
    8a^2-a+2=0
    272000=17500×[(1-(1+x)^(-360))÷x]
    0<4≤-4x
    272000=17500÷[(1-(1+x)^(-360))÷x]
    24.08614+7.942726x = (x-7.9)*60.936172/2+33.28559/2
    
    24.08614+7.942726x=(x-7.9)*60.936172+33.28559
    x2-68x+1075=0
    17.87*1000000=19.1*200*x*(310-x/2)
    17.87*10^6=19.1*200x(310-x/2)

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