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    arctan3.87 = x
    ( x - 30 ) * ( -2 * x + 160 ) ≥800
    (0.72+x)/(0.0006+x)=1.1
    (x-30)(-2x+160)
    X+(X*0.13)=565
    (x-30)(-2+160)
    x^(3)+12 x^(2)+42 x+38 x=0
    x-(x除1.13)=152900
    1.845e^(-y*0.5)+1.845e^(-y*1)+1.845e^(-y*1.5)+1.845e^(-y*2)+1.845e^(-y*2.5)+1.845e^(-y*3)+1.845e^(-y*3.5)+(100+1.845) e^(-y*4)=109.29
    1.845/〖(1+y)〗^0.5 +1.845/(1+y)+1.845/〖(1+y)〗^1.5 +1.845/〖(1+y)〗^2 +1.845/〖(1+y)〗^2.5 +1.845/〖(1+y)〗^3 +1.845/〖(1+y)〗^3.5 +((100+1.845))/〖(1+y)〗^4 =109.29
    x^2-124x-512=0
    10x^4-168x+158=0
    0.16666666666666667x^(2)-1.16826281007x+0.8333333333333=0
    1.845/〖(1+y)〗^0.5 +1.845/(1+y)+1.845/〖(1+y)〗^1.5 +1.845/〖(1+y)〗^2 +1.845/〖(1+y)〗^2.5 +1.845/〖(1+y)〗^3 +1.845/〖(1+y)〗^3.5 +((100+1.845))/〖(1+y)〗^4 =107.88
    675X+160X=74725
    (191199+4200+X)*105%=207825
    127692.77=C/8.4%*【1-(1/(1+8.4%)^15】
    0.16666666666666667x^(2)-1.16826281007x+0.3=0
    0.16666666666666667x^(2)+1.16826281007x+0.3=0
    (191199+3360+X)*105%=207825

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