20x≤400/x+30
    3/x+（x-1）∧-1≤1
    x-3≤4x+3
    3.14*1*120*x+3.14*0.5*0.5*2830≥2*2486.26
    16*a^2-32*a<0
    (800+x-12018.93)×(1-25%)+5063.15≥5634.18
    (800+X-12018.93)*(1-25%)+5063.15≥5634.18
    (5.8+2*t+0.8*10)*(8.4*t+91.90)/(12.6+t)/(11*10)>1.6
    (5.6+2*t+0.8*10)*(8.4*t+91.64)/(12.6+t)/(11*10)>1.6
    (4.6+2*t+0.8*10)*(8.4*t+88.30)/(12.6+t)/(11*10)>1.6
    (4.2+2*t+0.8*10)*(8.4*t+86.80)/(12.6+t)/(11*10)>1.6
    7*Y-196-183.36-83.2-3.75+183.36>260
    [10×0.7×y-(210-14)-183.36-1040×8%-100×5%]×(1-25%)+183.36≥1040/4
    0.15x/（ln(x+5474.3)-3.8 ）<1430.1
    0.15x/ln(x+5474.3)-3.8 <1430.1
    0.15x/ln(x+5474.3)-3.8 <1430.1
    0.275x/ln(x+5474.3)-3.8<1430.1
    m^2+m+4/17＞0
    1/x-2/（x^2）>0
    3x＋2≥7

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