1.691*(1.15+2.78*x/(x+1400))≤1.816*(2.78*x/(1400+x))
    70a+50(30-a)≤1600
    x^2-2x＞0
    -10x^2+110x+2100≥2200
    −(4a^3−a^2−14a−25)＞0
    −(4a^3−a^2−14^a−25)＞0
    −(4a3−a2−14a−25)＞0
    x^2-3x-10<=0
    (119+x)×0.9≤119
    4x((3x^2)-8x+6)>1.75
    sinx＞tanx
    2x+2-6<3x-3
    x-1<3x+1
    (1/2)x-1<=7-(3/2)x
    (2x+5)/3-1<2-x
    (2x+5)/3<2-x
    x-4/x+2>0
    -x^2+4<4
    m^2＞8
    (x+100)/240-x/280>=6000/10000

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