atan(0.77*3)+atan(3.33*3)-atan(0.144*3)-atan(0.1*3)-atan(3)-atan(36.67*3)-90
    454.296/98
    (2×16+0.8×9.8)×11.403
    20*lg(42.8*0.77/3)
    252.74+48.80 +232.52+866.52+283.86
    1/0.144
    1/0.77
    252.74+48.80 +232.52+866.52+141.93
    11300+3200+56250+18400+37500+71400
    54000-7×1000-10×650-2×1500
    6000-900×2-1000
    6300×2-2×650
    63000×2-2×650
    6900×9-9×650
    45/60=
    54000-4×650-1000×3-5×6000
    26500+20000+24900
    54000-10×650-14×1500
    12450×2
    (10000+1)(20000+1)/10000

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