1.4x=135%-1 3/5x
    30%x=3-7/10x
    43%x -18%x =0.975
    (11-10)*400+（11.5-10)*200-(12-y)*500=600
    290x=365
    x+0.09x=398
    x+1.09x=398
    x+0.06x=11088.91
    (48+x)/(89+x)=0.55
    (48+x)/(89+x)
    68.77=-14.51ln(x)+34.342
    72.07=-14.51ln(x)+34.342
    -4x^4 + 4x^2 -10^（-0.2425） = 0
    4x^2 -4x^4 = 10^（-3/10）
    0.687=-14.51ln(x)+34.342
    0.720=-14.51ln(x)+34.342
    (5.699-5.605)*200+(5.730-5.605)*100-0.1-0.1-(5.759-x)*200-0.2 =28.1
    (5.699-5.605)*200+(5.720-5.605)*100-0.1-0.1-(5.759-x)*200-0.2 =28.1
    (5.699-5.605)*200+(5.705-5.605)*100-0.1-0.1-(5.759-x)*200-0.2 =28.1
    x^2-x^4=0.1374

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