1-sqrt(5)
    -1/2[-sqrt(5)-1]^2-3/2[-sqrt(5)-1]+2
    -1/2[sqrt(5)-1]^2-3/2[sqrt(5)-1]+2
    -1/2[sqrt(5)-1]^2-3/2[sqrt(5)-1+2
    -2sqrt(2)-2
    -sqrt(5)-1
    2000*((1-1.05^(-26))/0.05)-2000*((1-1.05^(-10))/0.05)
    2^0.5+3^0.5+5^0.5
    !(1/2)
    !(e1)
    ln10 lge
    log(3,4,5)
    log(log(2,3),log(2,5))
    eA(2,3)
    1 - 2 * ( (60-30 +(-40/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) )
    e0
    1/6除√3/6
    15+10*2
    3∧√1
    e∧2

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