300-50+（21+16）*0.9/300
    （300-（50+（21+16）*0.9）/300
    （300-50+（21+16）*0.9）/300
    （300-50+37*0.9）/300
    （300-50+21+16*0.9）/300
    [170.49×12.5+ 553.45×8−3×(170.49+553.45)+0.5×12.72 ×13.86²×(3.5−1/3×13.86)]
    300-50+（（21+16）*0.9）/300
    300-50+（21+16）*0.9/300
    300-（50-（21+16*0.9）/300
    300-50+（21+16*0.9）/300
    300-50+（（21+16）*0.9）/300
    300-（50+（21+16）*0.9）/300
    12.72×13.86−56.22−22.42×3.5
    0.5×12.72×10.36²+ 12.72×10.36×6.14−56.22×6.14−170.49−0.5×22.42×6.14²
    0.5×12.72×10.36²×(4.5-10.36÷3)
    0.5×12.72×5.86²+12.72×5.86×3.04−56.22×3.04−0.5×22.42×3.04²
    12.72×5.86-56.22−22.42×4.5
    158×(1-0.55)/(1-0.55*0.97)×2143/3600
    158×(1-0.55)/(1-0.55*0.8)×1978/3600
    158×(1-0.42)/(1-0.42*0.9)×915/3600

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