(1000*1.4^9-1000)/2+1000
    (1000*1.4^8-1000)/2+1000
    1.0×(5236.95+586.39+264.94)+1.0×757.58
    (4+sqrt7)/3
    18+8
    √1.350069444444444
    √13.6025
    √1.35
    √13.6
    100/(1+15%)^1+110/(1+15%)^2+120/(1+15%)^3+130/(1+15%)^4+150/(1+15%)^5=
    100/(1+13%)^1+110/(1+13%)^2+120/(1+13%)^3+130/(1+13%)^4+150/(1+13%)^5=
    100/(1+12%)^1+110/(1+12%)^2+120/(1+12%)^3+130/(1+12%)^4+150/(1+12%)^5=
     (1000*1.4^10-1000)/2+1000
    (3000*1.4^10-3000)/2+3000
     (3000*1.4^9-3000)/2+3000
     (2000*1.4^9-2000)/2+2000
     (2000*1.4^10-2000)/2+2000
    (1000*1.4^10-1000)/2+1000
     (1000*1.4^9-1000)/2+1000
    （1000*1.4^8-1000）/2+1000

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