[(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
    (x+128x)+2x+x＝1600
    x*（0.0667+x)=1.8*0.000000333
    8.721x^0.365+x=0.5
    (7.6224+0.7378*y)*y=133.3
    （(2093+411-121-X-6140)/6140)*0.5=((1845+X)-3716)/3716
    (x+88)/(1-0.3%)*0.3%=
     3×x^2-44x+160 = 0

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