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    0.5*(779.423+796.197)
    0.5*(809.026+796.197)
    90+arctan(12.6)-arctan(12.6/2)-arctan(12.6/5)-arctan(12.6/10)
    10*2^(1/3)
    1/0.001283
    (0.4796/778.783)+(1-0.4796)/780.662
    e^(-3.14/sqrt(3))
    !(66)
    abs(-1)
    (2*√5-√2)*(√20+2)
    (2√5-√2)(√20+2)
    √(2+√3)+√(2-√3)
    √(2+√3)
    -600000+(160000/10%)×(1-1/(1+10%)^7)=
    -450000+140000/0.1*[1-1/(1+0.1)^7]=
    10000000+2000000*0.5=
    10000000+20000000*0.05=
    10000000+20000000*0.5=
    10000000+2000000*0.05=
    (6.59-5.2)/5.2

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