(1413.4×10^3)/(0.993×31730.1×215)+(0.977×462.04×10^6)/(1.15×7934076.85×(1-(0.8×1413.4)/351439.81k)×215)
    x
    2x-1/3x+4=60%
    (sqrt2*x-sqrt2)*(-sqrt2)/[(sqrt2*x-sqrt2)^2+x^2+2x^2]=(4*sqrt5)/5
    6.108=16*X/(X+2000)
    5.308=16*X/(X+2000)
    4.976+0.8=16*X/(X+2000)
    4.976=4.2*2.78*X/(X+1400)
    4.976=16*X/(X+2000)
    2554.68:7853.59=x:100
    50:100=x:100
    （26.253+x）×2.55＝52.306+70.359-x
    （26.253+x）×2.35＝52.306+70.359-x
    （26.253+x）×2.15＝52.306+70.359-x
    （26.253+x）×1.95＝52.306+70.359-x
    （26.253+x）×1.75＝52.306+70.359-x
    （26.253+x）×1.55＝52.306+70.359-x
    √28 x√21
    X+（X/1.13*0.05）=133240
    tanx=1/1.12

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