3971660000＝18.4*1520x*（1385-x/2）
    1000－30*[（1－K）/0.012]
    1.85/2/(12.1^0.85)*(x^0.85)=1/0.8
    1.85/2/12.1^0.85*x^0.85=1/0.8
    1×(1+x)^8=2
    1×(1+x)^5=2
    1*（1+0.071）∧t=2
    x+0.106x=220592
    6500*（1+0.9）∧45=W
    PV*（1+0.12）∧9=245000
    cosx+√3sinx+1
    77*r*r/100/10.50=0.366*80*24*(lg(r)-lg0.175)
    77*r*r/100/12.00=0.366*80*24*(lg(r)-lg0.175)
    77*r*r/100/10.00=0.366*80*24*(lg(r)-lg0.175)
    77*r*r/100/24.50=0.366*80*24*(lg(r)-lg0.175)
    77*r*r/100/14.50=0.366*80*24*(lg(r)-lg0.175)
    77*r*r/100/14.50=0.366*50*24*(lg(r)-lg0.175)
    77*r*r/100/14.50=0.366*50*24*(lg(r)-lg0.175)
    77*r*r/100/14.50=0.366*50*24*(lg(r)-lg0.175)
    77*r*r/100/14.50=0.366*50*24*(lg(r)-lg0.175)

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