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    (10500/1.11+17400/1.11^2+15600/1.11^3)-29800
    C(32,2)
     (10500/1.11+17400/1.11^2+15600/1.11^3)/29800
    (30600/1.11+36900/1.11^2+43700/1.11^3)/84000
    ((63.25/3.15+71.94/3.35+83.43/3.6+88.27/3.85)/4)*3.85*1.07
    (63.25/3.15+71.94/3.35+83.43/3.6+88.27/3.85)/4
    ((19.8*2.7+20*1+22*1.6+24*3.4)×64.2+25×-56.6)/(20.79×15+20)
    ((19.8*2.9+20*2.1+22*0.9+24*3.8)×64.2+16×-56.6)/(20.68×16+20)
    (19.8*2.9+20*2.1+22*0.9+24*3.8)/9
    (18.0×1.6+19.2*2.4+19.8*5.2+20*2.1+22*0.9+24*3.8)/16
    ((19.8*2.7+20*1+22*1.6+24*3.4)×64.2+25×-56.6)/(20.79×15)
    ((19.8*1.79+20*1.3+22*4.41)×18.40+20×-2.72)/(20.34×16+20)=
    [(5116120/(1.22×47.32×10^3 ) )^2+(26856/(10.92×10^2 ) )^2 ]
    (19.8*2.7+20*1+22*1.6+24*3.4)/8.6
    (18.0×0.7+19.4*3.4+19.2*0.8+19.8*4.1+20*1+22*1.6+24*3.4)/15
    120.6*4
    2*(8*6+8*3+6*3)-8*6
    2*(50*25+2.5*25+2.5*50)
    ((19.4*1.79+19.2*2.9+19.8*3.4+20*1.3+22*4.41)×18.40+20×-2.72)/(20.34×16+20)
    2*(50*100+2.5*100+2.5*50)

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