(8.5-tan30)*sin(45-21.06/2)/sin(45+21.06/2+30)+1/cos30+1.5
    21.1×1000×41.16×（402.1-41.16/2）
    0.58×402.1
    (270×3216.8)/(21.1×1000)
    3216.8/(1000×400)
    45×1.80/270
    （1000-2×30-4×35.8）/3
    1000-2×30-4×35.8
    (8.5-tan30)*sin(45-12.3/2)/sin(45+12.3/2+30)+1/cos30+1.5
    11*500000
    cos(56.3)
    cos(33.7)
    log(2,6)
    log(2,√6)
    log(2,0.2)
    10√2
    log(2,√8)
    2^3/2=
    2^2/3=
    2-2*0.5832

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