4×135×50+30×140×2
    (51954×10^3)/1640000+(95446.96×1087)/(2.18×10^6 )
    (51954×10^3)/1640000-(95446.96×1087)/(2.18×10^6 )
    4×135×20+20×140×2
    1+1
    1645/(7.06×0.95)
    1645/(7.06×0.95)
    (155.6+50)×0.8
    (155.6+50)/0.8
    360/4.06
    1250/(4.17×0.8×2)
    1250/(6.33×0.8×2)
    1270/(4.17×0.8×2)
    1270/(6.33×0.8×2)
    -3.1415926*0.5/(sqrt(0.75))
    -3.1415926*sqrt(2)/2/(sqrt(0.5))
    -3.1415926*sqrt(3)/2/(sqrt(1-0.75))
    arctan0.304
    arctan1.52
    10^(5/2)

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