((9-x)ln(9-x)-xlnx)/x(9-x)
    (9-x)ln(9-x)-xlnx=0
    ((9-x)ln(9-x)-xlnx)/x(9-x) = 0
    ((9-x)ln(9-x)-xlnx)/x(9-x)
    10000*0.8+10000*0.8*x/10=2800
    10000*0.8+10000*0.8*x/10
    4X+2*（35-X）=94
    2X+4*（35-X）=94
    5000000-500000/（4000-x）＝8000000/4000
    5000000-500000/4000-x＝8000000/40000
    4500000/4000-x＝2000
     x²-1834x+683280＝0
     x2-1834x+683280＝0
    3.44907*0.07534*(x^1.07534)-3.44907*1.07534*6.54566632*(x^0.07534)+26.90866736=0
    x1.6x200+x0.7x100+x1.3=15000
    arctan（7w）+arctan（3w）+arctan（w）＝180
    (80-80x)-(80-80x)x=51.2
    (80-80x)(1-x)=51.2
    80-[(80-80x)x]=51.2
    80-[(80-80x)x]=51.2

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