-6x^3-35x^2+54x=0
    -6x^3-35x^2+54.124x=0
    x=0.4x+600
    x^3+10x^2+24x+30=0
    A -1000- (A-1000）/1.06 × 0.06 - (A-1000）/1.06 × 0.06 ×12% -（A+1000）× 0.03% - (A -1000- (A-1000）/1.06 × 0.06 - (A-1000）/1.06 × 0.06 ×12% -（A+1000）× 0.03% )× 15%=1000×5%
    3/5cosx+4/5sinx=√3/3
    3/5cosx+4/5sinx=√3/3
    4（x-24）＝x
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x)/2/3.1415/x)+(3*x-1.25)*330*41820 = 0
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x/180*3.14)/2/3.1415/x)+x*330*41820 = 0
    2x^2-2/5x+1/25=1
    17.9×X=24.92
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x/180*3.14)/2/3.1415/x)+(3*x-1.25)*330*41820 = 0
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x/180*3.14)/2/3.1415/x)+(3*x-1.25)*330*41820 = 0
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x/180*3.14)/2/3.1415/x)+(3*x-1.25)*330*41820 = 0
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x)/2/3.1415/x)+(3*x-1.25)*330*41820 = 0
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x/180*3.1415)/2/3.1415/x)+(3*x-1.25)*330*41820 = 0
    4（x-24）＝x
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x/180*3.1415)/2/3.1415/x)+(3*x-1.25)*330*41820 = 0
    x*13.8*3.1415/4*2500^2*(1-sin(2*3.1415*x)/2/3.1415/x)+(3*x-1.25)*330*41820 = 0

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