（2000-20x）（x-50）=12000
    0.15/x
    10000-40 x=40 x- 2000
    (29*x/24)^2+(75/4-x)^x=(-29*x/24+145/16)^2+(x+45/4)^2
    lnx=-6.1
    lnx=-5.05
    （1000+30*x*x）/x/x+80/(1/6*x*x*x)=1.2*192
    （1000+30*x*x）/x/x=192
    ( 12827x3. 98% +X) + (12827-X) = 20%
    ( 12827x3. 98 +X) + (12827-X) = 20%
    ( 12827x3. 9813 +X) + (12827-X) = 20%
    80*x+75*(x-2)=1090
    e40*x+4000000*x-4000000=0
    12.1185+（X*0.0257）=X
    11.4385+（X*0.0257）=X
    12.0353+（X*0.0257）=X
    5/6-0.5x=3/8
    12.3234+（X*0.0257）=X
    15.2734+（X*0.0257）=X
    e^x+x/2=0

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