6/(1+(0.2*2^1.5))^(1.4/0.4)
    6/(1+(0.2*2^2))^(1.4/0.4)
    424-175
    100-45.6
    261-34
    374-68
    392-137
    09-08
    （5/10）+（1/7）
    8190+460
    392-172
    98777+987
    42.4-17.5
    tan1.575796
    17+13
    39.2-13.7
    3^ee
    76+1999
    ee4
    7+3

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