240+4x<=600
    140+3y+200>=1000
    (2x-8+3)/2<=(2x+6-4)/3
    (2x-8+3)/2<=(2x+6-4)/2
    5x－5＞5
    x＋4x≤400×70%
    x^2-100x-7500 <0
    x^2-100x-7500>0
    (2x-7)/(x+3)>2
    2x-7/x+3>2
    100+x/280-40 - x/280≥0.6
    10x-5(20-x)>120
    3x>6
    4x+18-6(x-1)>0
    4x+18-6(x-1)<5
    x^3-2x+1<0
    2<3x-7<8x
    x÷4-1＜（x-3）÷3
    (17.11x+272.21)((3-0.25-x)*3-(1.5-0.25-x)^2)＜0.7*(800/x)^(1/4)*1430*(0.25+x)*x
    24>3x/e sinx+cosx=1 1/2+3/4+7/8+15/16 14125 132+1234*24/124

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