arccos(-1/3sqrt(20))
    450+5×1375/3+1375/3=
    1/(1/75+1/300)
    (1/0.95)-1
    C(6,3)
    2.5/2
    C(3,2)
    21*(1+0.15*0.328)
    -0.1*ln(1-2.93/3.3)
    5/0/0
    9/3/3
     1/1*19+1/3*17+1/5*15+1/7*13+1/9*11+1/11*9+1/13*7+1/15*5+1/17*3+1/19*1-9/10*(1/1*17+1/3*15+1/5*13+1/7*11+1/9*9+1/11*7+1/13*5+1/15*3+1/17*1)
    1/1*19+1/3*17+1/5*15+1/7*13+1/9*11+1/11*9+1/13*7+1/15*5+1/17*3+1/19*1-9/10(1/1*17+1/3*15+1/5*13+1/7*11+1/9*9+1/11*7+1/13*5+1/15*3+1/17*1)
    1/1*19+1/3*17+1/5*15+1/7*13+1/9*11
    -1/2^3
    -1/23
    -1/2e
    6.72/22.4
    (5/67.4518)/(2/70.906)
    e^0.01

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