2*10^(-06)*150.946^2-0.0008*150.946^2+0.1139*150.946-4.914
    2E-06*150.946^2-0.0008*150.946^2+0.1139*150.946-4.914
    4*-3/abs(-3)
    （140.01^2-120^2）/15.31
    （140.84^2-120^2）/3.39
    （143.58^2-120^2）/12.73
    （147.3^2-120^2）/36.87
    （148^2-120^2）/6.67
    （148^2-120^2）/120
    2*0.7-5
    2.246^2
    0.4*2.27
    0.35*tan66
    tan66.2
    !(4655)
    tan66
    -1-(1-0.5)*(1/3)*(-(9/4))
    20(lg250-lg10)
    6×1.8+(6-1)×1.3+0.6
    4×(0.7291-0.25)

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