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
    48/(13/4)
    65/12.2
    7000-1771.4-98-3073.9-98-78
    159.2+220.2+169.2+144.2+144.2+144.2+194.2+119.2+119.2+119.2+119.2+119.2+119.2+368.9+407.2+407.2
    276*95%

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