1/2x-1≤6-3/2x
    （1+3x）/2≥2x-1
    x-1.5（2x-1）≤4
    x-1/2x-1/4x-1/7x＜6
    2+0.75（x-2）>0.8x
    2（x-4)≤x-1
    x(x-1)>＝0
    70*60+15（70-11y）+11y*10<=5000
    70*60+15（70-11y）*11y*10<=5000
    1+A>2
    x^2+12x+36-1/16>0
    1+2x/3<4
    -1≤1+2x/3
    -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

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