1.1×719.55×3
    0.5×12.72×(16.33−5.94)2 −(170.49+553.45+614.87+719.55)
    1/6×12.72×4354.7−170.49×14.94−553.45 × 10.44 − 614.87 ×5.94 − 719.55 × 2.44
    1/6×12.72×16.333−170.49×14.94−553.45 × 10.44 − 614.87 ×5.94 − 719.55 × 2.44
    1/6×12.72×2679.83−170.49×(14.94−2.44)−553.45×(10.44−2.44)−614.87×3.5
    1/6×12.72×2679.83−170.49×(14.94−2.44)−553.45×(10.44−2.44)−614.87× 5.94−2.44
    0.5×12.72×16.33²+12.72×16.33×13.09−56.22×13.09−170.49−553.45−614.87−0.5× 22.42×13.09²
    （1636-1000）×（25-20）/（5000-1000）+20
    1*（0.27+0.15）*0.02*20/0.27
    （0.27+0.15）*1*0.55/0.27
    (0.15/2+0.15/0.914)×0.27×1×25/0.27
    (0.15/2+0.15/0.881)×0.27×1×（25/0.28）
    （tan0.4444444）^(-1)
    0.5×12.72×16.33²+12.72×16.33×13.09−56.22×13.09−170.49−553.45−614.87−0.5× 22.42×13.092
    (（148-（500*0.4*0.08）-(200*0.1））*0.75)/300
    12.72×16.33−56.22−22.42×2.44
     [170.49×14.94+553.45×10.44+614.87×5.94−2.44×(170.49+553.45+614.87)+ 0.5×12.72×16.33²×(2.44−1/3×16.33)]
    1/6×12.72×1111.934656−170.49×(12.5−3.5)−553.45×(8−3.5)
    （1+12%/2）
    （300-50+（21+16）*0.9）/300

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