0.3m+0.8*(100-m)<=50
    5x≥2
    1/2x-1>7-3/2x
    5x-2>3*(x+1)
    3x<3
    2.5 * x ≥10000
    2.5x≥9000
    x-4≥2（x+2）
    -1/2*（x+1）<3
    67x<45
    0<2x-1<1
    3-x>0
    4－x^2>0
    -1/a<2
    (1+B+0.65)*1.225^2*1.108^2*1.048 >(1+B)*1.225^3*1.108^3
    (1+B+0.65+0.65)*1.225*1.108*1.048^2 >(1+B+0.65)*1.225*1.108*1.218*1.104*1.048
    50*0.8a+30(50-a)≤1600
    1.011x2-1020.1x+7075.25＞0
    x^2-9x-36>0
    x<[5-sqrt(41)]/2,4x^3-30x^2=34x+40

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