lg2/lg5
    lg5/lg2
    153846.15+76923.08
    153846.15+80645.16
    50000/0.65-50000/0.70
    50000/0.62-50000/0.65
    3.625%*2000000
    8%+4%*3.6%/6%*0.5
    8%+4%*10%/6%*0.81
    8%+4%*8%/6%*0.6
    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

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