2405+1760+1300+500+6155+2145+2550+4270+1420+465+450+510+530+2855+3000+3000+730+160+1620+5000+2980=
    2405+1760+1300+500+6155+2145+2550+4270+1420+465+450+510+530=
    2/((1-2^2)^2)
    0.5/((1-0.5^2)^2)
    3.93*10^-09
    3.931E-09
    3.93*10-09
    7^6-5^5-10
    7.96E-09
    （2640-2600）/(1+6%)*6%
    199*98/99
    199*98/99
    5691638761378.050781*0.4^5/2880
    400-328
    75/1.2
    60/37.5
    10/2*2.4
    1000*(1+10%)^3
    100*(1+10%)^3
    100-1800/19

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