2.9＋2.99＋2.999＋2.9999
    8.75－（5.75－2.97）＋3.03
    67.98＋14.37＋15.63－7.98
    3.79＋17.4＋6.21＋82.6
    （19+23+37+41+60）/5
    19÷4＋61÷4
    (100＋1000)÷25
    9×(8＋16÷4)－8
    496＋168÷7－16×6＋76
    1.07*20+0.2*(0.68*6.105*exp((1.27*20)/(237.7+20)))-0.67*2.5-2.7
    1.07*20+0.2{0.68*6.105*exp[(1.27*20)/(237.7+20)]}-0.67*2.5-2.7
    3×3√3
    0.3499999999999943*13*13+1.0499999999999545*13+211.70000000000005
    (123456789)
    atan1
    （30*20+30*20+20*20）*2+30*20*2
    6*14+6*5+14*5
    ln(0.2/(1-0.2))
    ln(0.99/(1-0.99))
    ln(0.2/0.8)

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