（1+5.17x^2-2.18x+0.24）*（1+x）*8546*54155*30/2214.5＞833
    （1+5.17x^2-2.18x+0.24）*（1+x）*10500*47486*30/1755＞833
    （1+5.17x^2-2.18x+0.24）*（1+x）*10500*47486＞833
    （5x-1）/4-1≤（2x+1）/3
    （5x-1）/4≤（2x+1）/3
    0.8*120（40-x)+90*1.1x<3880
     -200x^2+8800x-87000+200x-5800 ≥7200 800（x-16）≥7200
    -200x^2+8800x-87000+200x-5800≥7200
    100x+80*(50-x)<=4300
    2*x^2-5*x-25<=0
    x*x-175x+10000<0
    (60-x-40)(300+40x)≥6240
    0.7^x＜0.01
    (2x+1)/4<=(x-1)/3
    (9225+95x)/(117+x)>=80
    (9225+90x)/(117+x)>=80
    (9225+85x)/(117+x)>=80
    (9225+85x)/(117+x)>=85
    (9225+85x)/(117+x)>=90
    1079235+85x^2+(9225+117*85)x>=0

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