0.0000030363R^2-0.0004946R-1=0
    0.0000030363R²-0.0004946R-1=0
    403014.75ln（x）-505x-294642.25=0
    100x-x=271
    10x-x=271
    9-（4-x)=2
    （0.25－x）×（0.3－x）/（0.1＋x）=0.625
    ln0.02=-x*3.14/sqrt(1-x*x)
    （10－2x）²＝x²÷4＋9x²÷64
    9x²－250x＋25×25＝0
    x²－1＝0
    x＋1＝25
    x（0.05＋x）=5/8（0.35－x）
    4-x/5=2
    -11=3-2x
    （0.25－x）×（0.3－x）/（0.1＋x）=0.625
    1/8x+(10-x)=12
    1/8x+(10-x)=1
    x/(x+1)=0.9999999999999999
    x/(x+1)=0.9999999999999999

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