x^(2)－2x＋2>0
    1+2x>3x-3
    30*x+20*(100-x)≥2580
    （2500*12*0.9-70%*65*X*6.3%）/（30%*65*X*5%*65*X）=3.8%
    130*x+100*(100-x)≤11815
    (5/3)x+5(4-x)≤2（4-x）
    ((7-x)/2)-3≤(（3+4x)/5)-4
    （1/2)x-(x-3)>1/4
    x-2(x-3)>4
    (4x-10/5)-((5-x)/2) ≤3-2x/3
    4x-10/5-((5-x)/2)≤3-2x/3
    x-(7x-8)/2≤((6x+10)/3)-1
    -2≤4/a
    -2≤4/a≤-1
    18x-(8-x)*12=114
    114-18x=(8-x)*12
    m^2+2m+2-8m>0
    4m^2-4(m-1)(2m+1)>0
    -4m^2-m<1/16
    2(1/2m+1/8)^2-m-9/2m^2<1/16

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