4.2*1000*0.8*90/(1300*60)
    4.2*1000*90/（1300*60)
    4.2*1000*90/（1300）/60
    4.2*1000*90/（1300/3600）/60
    -3/1÷7.5
    (12.51×750^4)/(100×11×10^3×0.83×10^7 )
    (4.69×10^3×1.25×10^5)/(0.83×10^7×100)
    (0.89×10^6)/(1.67×10^5 )
    1/8×12.51×〖0.75〗^2
    62.53×0.2
    (0.667×54.13×200^4)/(100×1.124×10^9 )
    45.11×1.2×1
    (0.25×10^6)/(3.75×10^4 )
    (62.53×0.75×0.87×1000)/(3.14×9^2 )
    (40.90×870^4)/(100×210000×1983000×2)
    (3.87×10^6)/(39660×2)
    62.53×0.75
    (15.63×600^4)/(100×11×10^3×0.83×10^7 )
    (1.10×10^6)/(1.67×10^5 )
    1/8×15.63×〖0.75〗^2

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