1.25*25
    350/2*1.25
    e^(-0.05)*[(e^0.05)-0.9]*3/0.4
    e^(-0.05)*[e^(0.05)-0.9]*3/0.4
    887-887/9.8*5.2^2/50
    887+887/9.8*5.2^2/50
    887+5.2^2/50
    314.15926/60
    sqrt(654321*216644)=
    3/4
    (500+144-300)/6/10
    [2-e^(-0.2)]/1.6*70*[e^(-0.2)]
    e^(-0.2)*[2-70/1.6*e^(-0.2)]
    e^(-0.1)*100+5
    e^2
    (4)^3-3*（4）^2+2*(4)-1
    (2)^3-3*（2）^2+2*(2)-1
    (1+√3/3)^3-3*(1+√3/3)^2+2*(1+√3/3)-1
    (1-√3/3)^3-3*(1-√3/3)^2+2*(1-√3/3)-1
    （√3)^2

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