1+1
    0.5/0.33=
    200÷((500+300)÷2)
    200/［（500+300）/2］÷2/［（5+7）/2］=
    200÷［（500+300）÷2］÷2÷［（5+7）÷2］=
    lg1.4
    lg0.6
    arctan(-8)
    sin1
    lg26.02
    75+288
    140.85÷85
    6+6
    e＾95.66
     -arctan0.182
    -arctan0.091
    -arctan0.091
    -arctan0.91
    18 × (0.15 / 60) (0.33)
    √2 √3 √5

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