-3x^2+5.4x+1.6＜0
    1500x+2100(50-x)≤76000
    (1200+6x)*6/6.3>(1010+5.05x)*6.24/6
    1200*1.005^x*6/6.3 > 1010*1.005^x*6.24/6
    1200*1.005^x*6/6.3 < 1010*1.005^x*6.24/6
    ( 1200 * 1.005 ^ x ) * 6 < ( 1010 * 1.005 ^ x ) * 6.24
    (1200*1.005^x)*6<(1010*1.005^x)*6.24
    0<=（1-2a）/3<1
    （1-2a）/3>=4
    x+7>3x-1
    b+2>=3 B<2
    -4<=x<4
    4<=x<4
    6-2x>-2
    2x＋2>4x-4+6
    log(x,2x)>log(2x,3x)
    log(x,2x)>2
    sin(x)<0.5
    x^x<1
    x^2+x+1<1

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