11200x^2-4569.6x+35.739=0
    2×12.9×√(3.27×12.99)=
    x÷（16+x÷45%）＝25%
    ((2x+0.8×10.99)×(9.34x+84.1)/(11.9+x))/(11.45×10)=1.6
    8×0.8+7×11.1
    ((2x+0.8×10.99)×(9.15x+85.26)/(11.9+x))/(11.45×10)=1.6
    8×1+7×10.5+9.4×0.4
    ((2x+0.8×10.99)×(9.22x+85.72)/(11.9+x))/(11.45×10)=1.6
    8×0.5+7×10.6+9.4×0.8
    ((2x+0.8×10.99)×(9.31x+84.4)/(11.9+x))/(11.45×10)=1.6
    8×1.1+7×10.8
    ((2x+0.8×10.99)×(14.92x+203.4)/(11.9+x))/(11.45×10)=1.6
    （196374.60285-190382.23）/190382.23
    ((2x+0.8×10.99)(14.92x+203.4)/(11.9+x))/(11.45×10)=1.6
    5 x+－=1 8
    -24552.206+2.453*66066.45+0.143*411649
    18×1.1+17×10.8
    (18×1.1+17×10.8+14.92x)/(11.9+x)
    4（x+1）≤7x+13 x-4<3/x-8
    80748.38=29.856x+0.003x^2

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