4%+6%*3.6%*0.5
    4%+10%*6%*10%*0.81
    4%+8%*6%*0.6
    4%+8%*6%*8%*0.6
    30/(1+0.5)
    2/[1*(1+2)]+3/[(1+2)*(1+2+3)]+4/[(1+2+3)*(1+2+3+4)]+...+50/[(1+2+3+...+49)*(1+2+...+50)]
    1/[1*（1+2）]
    0.95-0.8965
    0.94-0.0435
    0.94-0.435
    .95*.973*.99*.9375*.95
    .95*.973*.99*.945*.95
    1-0.25*0.25
    0.09/0.175
    0.075/0.175
    （20.34-10.33）/20.34
    （20.34-7.11）/20.34
    （20.34-5.21）/20.34
    （20.34-3.14）/20.34
    （20.34-2.73）/20.34

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