(1-12.5%)*2.2/2-1=
    200×25
    48乘以16
    48÷16
    90÷39
    63÷18
    85÷41
    96÷32
    806÷80
    5400÷36
    5400÷40
    270÷18
    540÷18
    1360÷17
    680÷17
    340÷17
    170÷70
    1+2^-2*(abs0.064)^(1/3)-(9/4)^(1/2)
    2020ln2022-2021ln2021
    2022ln2020-2021ln2021

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