1.99*10
    100-10%
    1000-1000*10%
    1000-10%=
     C(4,2)
     C(4,4)
     A(4,4)
     A(4,3)
     A(4,2)
     A(4,1)
    1/10000∧(－1/2)
    1/10000∧－1/2
    9000/3.1415926/2.878
    9000/3.1415926/2.560
    9000/3.1415926/2.949
    9000/arccos0.998665/3.1415926
    50*360/5.922/2/3.1415926
    50*360/2.950/2/3.1415926
    50*360/4.763/2/3.1415926
    50*360/2.720/2/3.1415926

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