C(5,4)
     C(11,4)
     C(11,5)
    arccos0.969696
    11×65加53
    768÷65
    506÷30
    294÷13
    918÷51
    613÷40
    945÷13
    185÷37
    900÷32
    e^lnabs(-1)
    1/2*(7/2)^-7/2-4
    1/2*(5/2)^2+5/2-4
    12/-3
    1234567890/0123456789
    cos225
    arctanπ

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