√(2.79^2+((2×12-9.21)×9.21)/(ln (54.36+22)/22) ln (10+22)/22)
    (π×65.71×75.87)/(60×1000)
    56-377-423
    -4000（1+0.1702)^18-500(1+0.1702)^17
    561-(70+361)
    87402240/3.18
    60×75.87×1×(8×300×8)
    √((4-1.664)/3×(1-2.22)+2.22/1.664)
    (1×28×tan14)/π
    [28×(tan28.88-tan20.562)+89×(tan23.61-tan20.562)]/2/π
    [28×(tan28.88-tan20.562)+89×(tan23.61-tan20.562)]/2π
    arccos[89×cos20.562/(89+2×1×cos14)]
    arccos[28×cos20.562/(28+2×1×cos14)]
    arccos (123/130)
    1-2/3/2
    1/3+1
    3333-3333
    3^1
    1^10
    1^3

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