Mathematics
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    C(100,20)
    e-0.3
    2 000×(1+8%) -1
    sqrt(4)/2
    sqrt0.4|4
    sqrt9
    4^1/2
    (-√7)^2+9
    3乘以3/4
    3-3/4
    78×6×83/348
    25×〖2.5〗^2/2
    arctan 4
    arctan 4
    6×(-4)-(-4)×6
    [0.3×(20%-8.5%)²+0.4×(10%-8.5%)²+0.3×(-5%-8.5%)2]½
    [0.3×(20%-8.5%)²+0.4×(10%-8.5%)²+0.3×(-5%-8.5%)2]½
    [0.3×(20%-8.5%)²+0.4×(10%-8.5%)²+0.3×(-5%-8.5%)2]½
    (0.3*(0.3-0.145)*(0.3-0.145)+0.4*(0.1-0.145)*(0.1-0.145)+0.3*(0.05-0.145)*(0.05-0.145),1/2)
    4+8

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