400*2*4+2500*2*0.67/2*4+7.5*2*80/12*2/2
    400*2*4+2500*2*0.67/2*5+7.5*2*80/12*2
    400*2*4+2500*2*0.67/2*5+7.5*2*80/12
    400*2*4+2500*2*0.67/2*5+7.5*2*80/12
    400*2*4+2500*2*0.67/2*5+7.5*2*80/12*2
    400*2*4+2500*2*0.67/2*0.5*4+7.5*2*80/12*2
    400*2*4+2500*2*0.67/2*0.5+7.5*2*80/12*2
    400*2*4+2500*2*0.67/2*5+7.5*2*80/12*2
    2-9/2
    2-9/2
    12000/2*5/12*6+6000/2*5/2
    10^(-0.182)
    10^-0.071604
    10^(-0.216)
    10^-0.216
    0.51^(-1/2)
    0.509^-0.5
    10^-0.15
    -0.509^-1/2
    500*600=

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