(2228.52*1000)/(298*100)+(277.39×10^6)/(1.15*4.31×10^6 )
    (2228.52*1000)/(2.98*100)+277.39/(1.15*4.31×10^6 )
    2×6×√1.371
    0.729×(18.7×3.9+20)-10.246
    0.729×20
    2×6×√0.729
    0.704×20
    2×8×√0.704
     0.65*0.7 +16
     0.65*0.25 +16
     0.65*0.5 +16
    0.65*0.3 +16
    0.65*0.25 +16
     0.65*0.24 +16
    189123.256+166689.397+129013.027+91336.656+55226.814=
    10.2/0.6
    （12-1.8)/0.6
    （12-1.8）/0.65
    arccos-6
    cos-6

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