300.49982*tan(23*0.5+23/60*0.5)+30.01
    1600*tan(12/2)
    400.0*tan(26/2)
    400.375*tan(26/2)
    400*3.14/180*25
    400*tan(25/2)
    arctan(4.9197)
    arctan(-0.3482)
    3*8
    (21-56/3)*1/2
    1＋1
    ((1.06)^2-1)
    ((1.06)^1.5)-1
    （1.06）^1.5
    1.01^365
    lg(0.2)
    （207.5-517.399725）/207.5=
    309.399725+208
    9.599557+0.643348*466
    1乘8

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