1000/(1+x)+2000/(1+x)^2+6000/(1+x)^3+4000/(1+x)^4 = 7000
    abs(x-1/x)=1
    1.5*(4054801+x)+12815+722083+126590=7180800
    1.5*(4054801+x)+12815+722083+126590=6038400
    4054801x
    56Q-(580+40Q)-(56Q*0.13-5Q)*0.12=0
    0.583＝8708.7e^36.43x
    0.583＝8708.7e36.43x
    x（0.1x+1）（x+1）+20＝0
    -781x+4021=-5.9x+1686.5
    x+2=3
    x^3=3
    81-40.5-x*(9+x)/2-(9-x)*x/2=13.5
    81-40.5-x*(9+x)/2-(9-x)*x/2=13.5
    （x-1）（2x+3）=2x+3
    （x-40）（740-10x）=2640
    x+1=2
    7x+5.3=7.4
    X-（0.8X*20%）=X
    0.8X*20%=

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