38.6*3964（200+x）=3*1000000*200*（x-3764）
    ln(-2x)＝1
    (8-X)/5
    (8-X)5
    arctan(x)+arctan(0.5x)=44π÷180
    arctan(0.1x)+arctan(0.5x)=50π÷180
    20lg(x)=-22.85
    20lg(x)=-22.85
    20lg(x)=-22.85
    arctan(x)+arctan(0.5x)=46π÷180
    lg(x)=-15.39÷20
    arctan(0.1x)+arctan(0.5x)=50π÷180
    5000除x减2等于6000除1.5x
    (t)∧2＋15t－150 =
    cos186.15＝1.0375cosx-1.7836cos（x-186.15）-0.0066501
    cos98.848＝1.0375cosx-1.7836cos（x-98.848）-0.0066501
    cos98.848＝1.0375cosx-1.7836cos（x-98.848）-0.0066501
    cos98.848＝1.0375cosx-1.7836cos（x-98.848）-0.0066501
    cos98.848＝1.0375cosx-1.7836cos（x-98.848）-0.0066501
    cos91.009＝1.0375cosx-1.7836cos（x-91.009）-0.0066501

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