13.24x=(3.5+x)*8.96
    13.24x=(3.5+x)*8.97
    （0.001+x）/（0.1-x）/（0.01-x）=32
    (x-30)(-2x+160)=800
    (x-30)(x-160)=800
    (x-30)(-2x+120)=800
    (x-30)(-2x+120)=800
    （0.5-0.2x）(600+1500x)=300
    30l-3l²=15l-l²
    15x^2+x^3＝150
    y
    72+30l-3l²=0
    72+30l-3l²=72+15l-l²
    144+45l-4l²=0
    7a^2+a=11
    2a=8
    l²+3l²
    72+15l-l²=72+30l-3l²
    72+15l-l²=72+30-3l²
    ex+sinx=1

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