（-1/2）^-1
    (9/0)-(9/0)
    (9/0)-(8/0)
    9/9/9/9/9/0/9/9/9/9/9
    9/9/9
    2.41×12
    log（3，27）
    (50.85×1000/(0.664×5.71×10^2 )+(39.42/19×10^6)/(7.7×10^3 )
    (39.42×10^6)/(7.7×10^3 )
    50.85×1000/(0.664×5.71×10^2 )+(39.42×10^6)/(7.7×10^3 )
    21.9×1.8
    sqrt(6.1078^2+8.4070^2)/300.2202
    atan0.03461126200035840359842542240662
    91.2÷3.8
    91.2÷3.4
    -1/14
    5-2 4/2
    290.49×298.15+0.1181×298.15×298.15-25.439×298.15×298.15×298.15×0.000001
    (23.08+23.46+23.26+22.9
    arctan0.79

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