x-360/3600=x-552/3000
    x+x*x=0
    -x^2-4x+1
    -x^2-4x+1
    2*x^3+6*x^2+11*x+7=0
    (176.5+317)/31*x+104/31*(x+15)+124/31(x+30)=846
    16a+a²=225
    A×(1+5%)+A=15
    0.1/x=1.18
    5*x^3+35*x^2+100*x+112=0
    x+0.05x=1600
    （26.293+x）×3.05＝26.293+71.778-x
    （26.293+x）×2.85＝26.293+71.778-x
    （26.293+x）×2.65＝26.293+71.778-x
    （26.293+x）×2.45＝26.293+71.778-x
    x+1/x-5/2
    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%
    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%
    A - A/1.06 × 0.06 - A/1.06 × 0.06 ×12% -（A+1000）× 0.03% - { (A-A/1.06 × 0.06 -A/1.06 × 0.06 ×12%-（A+1000）× 0.03%)× 15%}=A×3%
    A - A/1.06 × 0.06 - A/1.06 × 0.06 ×12% -（A+1000）× 0.03% - {(A-A/1.06 × 0.06 -A/1.06 × 0.06 ×12%-（A+1000）× 0.03%)× 15%}=A×1.03

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