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/2/3.1415/x)+(3*x-1.25)*330*41820=0
    30-2x＝4（30-3x）
    x^4-（x-0.02）^4=0.3104
    x^4-（x-0.02）^4=3.996
    sinx+x^2+x=1
    x^4-（x-0.02）^4=2.695968
    x^4-（x-0.02）^4=4.0456752
    x^4-（x-0.02）^4=4.0456752
    sinx+x^2+x=1
    (192.5+309)/31*x+186/31*(x+15)+124/31(x+30)=1122
    X²+3=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% )× 25%=1000×3%
    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%=1000×3%
    sin（ln(x)）
    (24+x):3-(4x+8):3=5
    X^3-3X+1=0
    0.0112x/1.01-x=200000*0.06*1.12/1.06-200000
    x/1.01*0.01*1.12+(200000-x)=200000/1.06*0.06*1.12
    x/1.01*0.01*1.12+(200000-x)=200000/1.06*0.06*1.12

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