75*(1/9%-1/(9%*(1+9%)^20))+100/(1+9%)^20
    7.5*(1/9%-1/(9%*(1+9%)^20))+100/(1+9%)^20
    !(0.5)
    !(20)
    !(10)
    A(100,80)
    A(100,100)
    6.4*5/9
    4√15÷3
    √80 √3
    √240
    0.9×9/7
    2÷3/1+3/1
    0.1÷ 1%
    4÷5/3
    9÷2/3
    62*1847
    62*1847
    2*31
    （1521.5+30.43+34.71）×5%

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