3x＾2+8x+1=0
    y=0.5×(2/17)^2×30
    2（x－1）＝4X－3
    abs(-1.5x+3)-4<0.5x-3
    14.2=11.5+0.1/(0.1+0.9x)*4.1
    13.5=11.5+0.08/(0.08+0.92x)*4.1
    13.4=11.5+0.06/(0.06+0.94x)*4.1
    13.4=11.5+0.04/(0.06+0.94x)*4.1
    25.1=15.5+0.04/(0.04+0.96x)*20.8
    18.8=13.9+0.04/(0.04+0.96x)*13.7
    12.9=11.5+0.04/(0.04+0.96x)*4.1
    12.8=11.5+0.04/(0.04+0.96x)*4.1
    40.3=25.9+0.04/(0.04+0.96x)*36
    40.3=25.9+0.02/(0.02+0.98x)*36
    33.4=21.9+0.02/(0.02+0.98x)*33.5
    26.2=19.2+0.02/(0.02+0.98x)*25.1
    22.6=15.5+0.02/(0.02+0.98x)*20.8
    17=13.9+0.02/(0.02+0.98x)*13.7
    12.4=11.5+0.02/(0.02+0.98x)*4.1
    x*2/3+255/3=238 x*2/3+225/3=94 x*2/3+210/3=151

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