(19.7×8.5×2.145+16×2.67)/(19.7×15+20)
    -115.7+20.5*(1-1/1.085^10)/0.085-1.6/0.085*1.085^10
    √35000
    -9700+485/1.012+1455/1.012^2+9700/1.012^10
    √65000
    -9700+485/1.052+1455/1.052^2+9700/1.052^10=
    √7
     √6
    1.25*1.1*(0.6*0.8*14+0.5*0.7*20)*25+5*14+0.02*3662.74
    1.25*1.1*(0.6*0.8*14+0.5*0.7*20)*25+5^14+0.02*3662.74
    -100+23/1.115+31/1.115^2+38/1.115^3+52/1.115^4
    -100+52/1.115+38/1.115^2+31/1.115^3+21/1.115^4
    -101+25/1.114+30/1.114^2+39/1.114^3+50/1.114^4
    sin（3.14*0.53）
    sin（3.14*0.36）
    4301.172*(0.8/0.9)^1/5+785*(0.8/0.9)^1/4
    4301.172*（0.8）^1/5+785*(0.8)^1/4
    32^2
    1/2×1.7×18
    (30600/1.11+36900/1.11^2+43700/1.11^3)-84000

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