（8-100x）(1+2x)≥0.78*8
    -x^2-2x+1<0
    x/1500-x/5100>0.1
    x/340-x/1500<0.1
    x/340-x/5100<0.1
    2-x-x^2＞0
    3.792663444/((1/8.889*x^0.6+0.00002)*1.2+0.000283)>4000
    1/((1/8.889416462qi^0.6+0.00002)+0.000283479)*3.792663444>4000
    x≥(2√(2)-1)(√(16+16))+√(2)(4-4)
    1/2(3-3x)<=2-sqrt2 x
    -9x-1/2(2x-8)<14-5x
    cotx＞1 sinx=0.5
    cotx＞1
    2x+5≥0 3x-10＜0
    1＜(x+3)(x+5)＜3
    (x+3)(x+5)≥0
    k^2-6k+25≥0
    -3+2x≤2x-1≤3-2x
    4*x^2+4-4x＞0
    （x-2）（x+1）≥0

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