20*180/3.1415926/2.720
    50*180/3.1415926/2.765
    50*180/3.1415926/0.962
    20*180/3.1415926/1.265
    50*180/3.1415926/0.874
    21×12
    95-36
    57-18
    960+644
    960-316
    15×0.66×0.52=
    15×0.66×0.5=
    35×0.66×0.5=
    35×0.65×0.5=
    25×0.65×0.5=
    25×0.66×0.5=
    15×0.66×0.5=
    15×0.65×0.5=
    15×6.5×0.5=
    2sin(-π/12)

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