（1-571428*50）/-49
    (1400000000/49-1)/50
    2*10^(18.9/20)
    20*lg2
    20*lg4
    21.303*0.22167^0.6322=
    log(45,3)
    21.294×0.22454^0.5542
    3e/5^2+2.5*2.5
    -7.403+23.414
    -90-arctan2.25-arctan0.45
    （tan40.9）^2
    4/3*π
    1-0.24-0.00035+0.000084
    0.00035*0.24
    sqrt12
    90-arctan3.4
    22/25 3.68/16 33.8/13 1.2/30 5.6/28
    72.42/17
    50.4/9 30.16/8 12.81/21 8.4/15 21.36/24 6.25/25 72.42/117 1.1/2 1.5/30 2.45/49

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