Mathematics
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    7/1+3/1-2/1=
    1×1.86×1 161.44/(2×10^5 )(30+32.76)/(0.36+1.7×0.1)
    1×1.86×1 161.44/(2×10^5 )(30+32.76)/(0.36+1.7×0.02)
    1×1.86×1 161.44/(2×10^5 )(30+32.76)/(0.28+10×0.02)
    1×1.86×1 161.44/(2×10^5 )(30+32.76)/(0.28+10×0.1)
    1×1.86×1 161.44/(2×10^5 )((30+32.76)/(0.28+10×0.1))
    5542/(200×1400)
    1+0.5×1867.13/1089.75
    x = 3 + 1
    6/3
    10(1/x+1/40)=1-1/4
    a^3+3×(1475.7-335)×a^2-72×560.6×(1475.7+335-60)(610-a)/670=0
    a^3+3×(1475.7-335)×a^2-24×560.6×(1475.7+335-60)(610-a)/670=0
    a^3+3422a^2-52734.2(610-a)=0
    a^3+3422a^2+52734.2a=52734.2×610
    (a-1711)×(a^2-2874786.8)=52734.2×610
    lnx=-3.056065922
    ln1.45
    ln(x/1-x)=-3.056065922
    2=10/x

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