Mathematics
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    1653-12+2.5+2
    arcsin0.6747967
    cos(4/7*π)+cos(3/7*π)
    [9*1.832*10^5/2*9.8(981-1.293)]^1/2
    √(9*1.013*10^-5*9.2*10^-5/(2*9.8(981-1.293)))
    √(9*1.013*10^-5*9.2*10^-5/(2*9.8)(981-1.293))
    (7.9*10^-3)^1/2
    33197+85000-85000-(120000-160000)*(1+10%)
    905+325+80+410+110+215
    -lg0.01
    -lg0.9
    (1+5%)^10*0.0538
    49469*1.25*1.2*1.04
     ((200)*6.25+1100*20)*(1.15+0.2+0.15+0.35)
    ((300)*6.25+1100*20)*(1.15+0.2+0.15+0.35)
     ((300)*6.25+1100*20)*(1.15+0.2+0.15+0.35)
     ((300)*6.25+1100*20)*(1.15+0.2+0.15+0.2)
    【(200)*6.25+1100*20】*(1.15+0.2+0.15+0.2)
    【200*6.25+1100*0】*(1.15+0.2+0.15+0.2)
    (272.62/(10.42%-3%)*(1-((1+3%)/(1+10.42%))^10))/(1-(1+5%)^10/(1+10.42%)^10)

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