｛(60%-30%)^2*0.3+（40%-30%）^2*0.2+（20%-30%）^2*0.3+（-10%-30%）^2*0.2｝^（1/2）
    1/118
    2023/(2023+2023/2024
    2023/(2023+2023/2024)
    0.5+1/4+0.125+1/8-1
    52.5*（1+9.1%）^10
    52.5*（1+9%）^10
    sin(arctan(sqrt(2))
    sin(arctansqrt(2))
    -20*ln10+10-0.1
    -4*ln4+4-0.25
    1+2=
    A(3,2)
    48192/4.8%×（1-1/（1+4.8%）^32)×(1/(1+4.8%)^8)
    34910/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    23➕25
    （4/5+1/2）*2=
    407/4-√16180/2
    407/4+√16180/2
    arctan(sqrt0.5)

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