40x+30(8-x)>=290 10x+20(8-x)>=100
    (m-2)/7<0
    0.5<=x x<4 0.5<=-x -x<4
    5x-1>3(x-2) 2-x<=5 x-2<=5
    7y<4y+20 4y+20<8y
    3+0.5y>0
    (3x+2)/4>x+π
    x-1<-3 2x+9>=3
    sqrt(49*k*k+56*k)>7*k+2
    sqrt(49*k*k+56*k)>-7*k-2
    2(3x一10)一4<2(5x十7)
    -5x-13>0
    -0.2x<-50
    -x/3>-4/3
    5x/12>1/4
    3-2x≥2+x
    21(50-y)+32y<=1500
    2+[3(x-1)]/8>3-(x+1)/4
    -5/4【4/3（-3/2-12x)+4x]<=-(3x-1/4
    m<24-3/2m

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