30.873ln(x) + 5.6328=50
    (173.5+364.5)/29*x+145/29*(x+15)+87/29*(x+30)=2130
    18%×x+13%×（1-x）=16%
    （x*4%+x）+（70-x）*40%＝103.6
    17x^5-36x^4+17x^2-36=0
    30.879ln(x) + 0.8492=84.1
    30.879ln(x) + 0.8492=50
    0.3x+1=10
    30%x+1=10
    0.3x+1=10
    30%x+1=10
    15=100×（x-216）/（x×190/100）
    （40.221+x）×1.95＝40.221+70.242-x
    （40.221+x）×1.75＝40.221+70.242-x
    （40.221+x）×1.55＝40.221+70.242-x
    （40.221+x）×1.35＝40.221+70.242-x
    （40.221+x）×1.15＝40.221+70.242-x
    （40.221+x）×1.15＝40.221+70.242+x
    300.5/29*x+116/29*(x+15)+87/29(x+30)=1023
    1-3-x/2=x-3/4

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