4^x-2^x-6<0
    4*-2*-6<0
    x×（2+cosx）-3sinx≥0
    x×（2-cosx）-3sinx≥0
    5x+1/2-2x-1/3 ≥-1
    5x<7x
    225.043X-1557990+12.285X+49950>4000000
    2<=1.5x<3
    -1<=-2x/3<0
    -1<=-1.5x<0
    3(x-1)+2<5x+3 (x/3)<((x+1)/4)
    x-2(x-2）x≤4
    X—2（x—2）≤4
    2/X-（0.1x+0.8）/x<5x
    (x-2)/3+4＞x
    2(x-1)+3＜3x
    22400≤200x+240(100-x)≤22500
    3<2a+1<7
    x-（7x/6+8/6）≤1+x/2
    41x>-11

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