58.65*exp(- 0.01577*x^1.462)=15
    58.65*exp(- 0.01577*x^1.462)=20
    58.65*exp(- 0.01577*x^1.462)=30
    13.39x^2 - 5.1932x - 389.50096 = 0
    5x^2-14x+9＝0
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.552
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.552
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.552
    x^3=1
    -484.299t^{3}+5782.238744t^{2}+7027.999944t+3.14637 = 0
    x^2=2
    x^=2
    x^2+3x+2=0
    400-100=80%X-70%X
    400-100÷80%X-70%X
    （400-100）÷（80%X-70%X）
    26+9t-4.9t^2=30
    15%x-120=10%x+120
    15%x-10%x=120+120
    15%x+120=10%-120

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