4.8082=（30.56*0.847*（x+0.1））/（1+0.847（x+0.1））*（100-1.4-8.28）/100*1/(1+0.31*1.4)+（2.26（x+0.1））/（1.3*0.101325）
    0.56x^2*(12.7-x)/(0.9+0.2x)=2250*12/4440
    0.56x^2*(12.7-x)/(0.9+0.2x)=2250*12*1.25/4440
    0.56x^2*(12.8-x)/(0.9+0.2x)=2250*12*1.25/4440
    0.56x^2*(12.8-x)/(0.9+0.2x)=2250*12*1.25/2961.8
    0.56x^2*(12.8-x)/(0.9+0.2x)=2250*12/2961.8
    0.56x*(11.2-x)x/(0.9+0.2x)=2250*12/2961.8
    [(4.5+x)/1.06-0.441]/0.7*0.3-0.441=X
    3*x*x*x+x+2=0
    R1=5100 R3=5100 R2=82 R4=82 R5=1000 R7=4700 R8=200000 Vcc = 3.3 Vref = ((1/(R1+R2) + (1/R3 + R2/(R7*(R1+R2)))/((1/R3 + 1/R4 +1/R7)*R4))*Vcc)/(1/R5+1/(R1+R2) + 1/R4 - (1/R4 - R2/(R7*(R1+R2)))/((1/R3 + 1/R4 +1/R7)*R4))
    12*5-5X=50
    1.2＾2.5×x×(1-(x＾2)/6)＾2.5=0.236127508
    xxx-2xx+x-2=0
    125/(34+10x)=(30+x)/60
    68+20x=4.08*(15+0.5x-125/(34+10x))
    68+20x=4.08(15+0.5x-125/(34+10x))
    （20000+105000）/（34000+10000x）=(30+x)/6
    1.2＾2.5×x×(1-(x＾2)/6)＾2.5=0.5917
    4x+128＝1600
    (x+128)+2x+x＝1600

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