16x+1200-12x≤1200*2/7
    16x+1200-12x≤1200*7/2
    (x-5)/x≤0.8
    x-5/x≤0.8
    k/2≤5k-1
    1.5x+(2.5x*x*x/(4-x*x))-x*x+4<0
    32k^(2)减去16k减3小于0
    （x-2.1823）/x=-1.08%
    （x-2.1823）/x=1.08%
    1.0948X+(1-X)0.92<0.98
    1.9048X+(1-X)0.92<0.98
    -（x-1）>3 2x+9>3
    -（x-1）>3 2x+9
    2x+1>-1 2x+1<3
    2x+1>-1
    8x/((x-6.35-(x/100))^3*(6.35+(x/100))*3.14) <1.99
    8x/((x-6.35-(x/100))^3*(6.35+(x/100))*3.14) <3.546
    8x/((x-6.35-(x/100))^3*(6.35+(x/100))*3.14) <2.6237
    8x/((x-6.35-x/100)^3*(6.35+x/100)*3.14) <2.6237
    8x/((x-6.35-x/100)^3*(6.35+x/100)*3.1415926) <2.6237

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