（100-98.2850）/2=
    -15850000/（6351*25）=
    15850000/（6351*25）=
    -25000000/（7230*25）=
    25000000/（7230*25）=
    3.27-3.75/(1+1%)^2=
    3.27+3.75/(1+1%)^2=
    ln3/9
    ln2/4
    1/e^2
    A(5,2)
    (0.0061*0.7475+0.0980*0.2525)/（1.01）=
    (0.098*0.7475+0.2884*0.2525)/（1.01）=
    1/7×12/11+1/7×16/11+1/7×2/11
    (0.0061*0.7475+0.0543*0.2525)/1.01=
    (0.2-0.1)²×0.3+(0.1-0.1)²×0.5+(-0.05-0.1)²×0.2
    15%²
    10%²×0.3
    0.1²
    10^9+7

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