（1*120+0.8*50)/(0.9*120+0.6*50)
    （1*70+0.8*60)/(0.9*70+0.6*60)
    （1*70+0.8*60)/(0.9*7+0.6*60)
    6368.5+6553.2+6833+7081.3+7117.6=
    sin144
    sin27
    cos144
    sin144
    arccos0.15
    arcsin0.15
    arcsin0.8
    sin0.8
    （15+X）/（5+X）=2
    130000(1+x)^20+130000(1+x)^19+130000(1+x)^18+130000(1+x)^17+130000(1+x)^16 = 1085376
    s^3+s+1=0
    -6-x+3x^2-0.5x^3
    x+1 x=5
    x+1
    a/（5.76a+937.5+4464.3）=0.1
    x/（5.76x+937.5+4464.3）=0.1

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