arctan0.0018
    (4/7)÷(3÷5)
    (4/7)/(3÷5)
    13/5
    1/4＋1/5＋1/6＋1/7
    1+3
    1÷4＋1÷5＋1÷6＋1÷7
    20*180/3.1415926/2.138
    50*180/3.1415926/2.833
    20*180/3.1415926/1.401
    95÷6
    50*180/3.1415926/1.829
    20*180/3.1415926/0.559
    95－36
    50*180/3.1415926/3.130
    19.0－7.2
    50*180/3.1415926/0.628
    20*180/3.1415926/3.252
    50*180/3.1415926/2.874
    50*180/3.1415926/2.736

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