8*(1/3.5+1/4+1/4.5+1/5)
    8*（1/3+1/3.5+1/4+1/4.5)
    (0.677*85.9*0.6*150^4)/(100×12000×42187.5)
    5.64/(2.25×10^(-3) )
    0.14/(5625×10^(-6) )
    (0.677*98.08*0.6*150^4)/(100×12000×42187.5)
    (0.677*71.4*0.6*150^4)/(100×12000×27462.5)
    (0.677*85.9*0.6*150^4)/(100×12000×27462.5)
    (0.677*98.08*0.6*150^4)/(100×12000×27462.5)
    (0.677*98.08*0.6*200^4)/(100×12000×54925)
    (0.677*98.08*0.6*300^4)/(100×12000×54925)
    (0.677*98.08*0.6*300^4)/(100×7000000×54925)
    (0.677*98.08*0.6*300^4)/(100×12000×54925)
    (0.677*98.08*0.6*300^4)/(100×7000×54925)
    e^(1/7)
    log（（118.3/105.7），（125/22））
    3750*25=
    128/(65+128)
    1000/（1+15%）^0+2000/(1+15%)^1
    2000/(1+15%)^5+4000/(1+15%)^6

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