log(120/3,2)
    log(1400/3,2)
    -log(1/60,2)
    2log(2.8,2)
    2log2.8(2)
    arctan(0.093)
    arctan(0.093)
    arctan(0.093)
    arctan(0.093)=
    e
    cos90
    6.28/2^1/2/2
    6.28*1.21
    arccos（2^0.5/2）
    arccos1.414
    -2e^2
    -2/e^2
    75×28+34(63−58)
    5+2*0
    4/3-8

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