(1+k)^10
    (4+0.4n)*(20-n)
    10％ = 9％×（1/55％）×X/（1-9％×（1/55％）×X )
    100,000,980,001,501
    57
    58
    53
    2020009222
    23 4354 778 12 45 8 65
    65
    54000-5.7967x=
    27185912
    0.65:0.75
    0.65：0.75
    16:24
    2 1 2/3
    2
    93,87,89,90,91
    93,87,62,89,90,91,97
    2200,800,200,500

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