3x^2+300x+5000=0
    x^3+x^2+30=0
    （x-5）（x+3）=6
    （X+3）（X+7）=5
    4x+4（224-2x）=500
    （5.42-5.42/1.13*0.13+0.13）/7.01=X
    （6.4-6.4/1.13*0.13+0.15）/7.01=X
    x=78100+1.33%x
    x=77900+1.33%x
    (1950-3400)/(x-200)=(0-1950)/(60-x)
    4123.87=105876*(X+1)/2*28.5*1%
    （1.25x+1.2（300-x））*0.8=296
    （1.69-1）/(x-1.9)=(2-1.69)/(1.79-x)
    x-ln（x）=1.5
    3.38*（1+x）=4.1002
    (1-x)*1000000=e^40x
    1-x=e*40x
    0.132/x＝0.1289/0.86289
    0.4/100.58＝x/33.2
    （26.253+x）×2＝52.306+70.359-x

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