240-120
    3000÷125
     480÷40
    0÷11199
    1-10000
    1111-11999
    2/e
    40÷10
    60÷5
    800÷32
    84÷31
    sqrt(750^2+1000^2)
    364÷72
    242÷48
    140÷28
    ln(0.5)/[0.2ln(0.9)]
    ln(0.5)/0.2ln(0.9)
    cos4π
    0.2*ln(0.9)
    3/4-1/5+1/2-4/5

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