336.091*10^6<13.8*1200*x*(1050-x/2)
    419.21*10^6<13.8*1200*x*(1050-x/2)
    779.79*10^6<13.8*1200*x*(1050-x/2)
    3x-4>2+5x
    x-3(x-2)>=4 (1+2x)/3>x-1
    2x-1>0 -3x-1>3 3(x-1)+13>5x-2(5-x) 5-(2x+1)<3-6x
    x-1<=(3/4)x-(1/8)
    2x>1-x x+2<4x-1 x-5>1+2x 3x+2<=4x
    2x-1<4
    x+1/2>3
    (0.007/(0.5a-0.02))+(0.016/(0.5a-0.01))≤0.72727
    (0.007/(0.5a-0.02))+(0.016/(0.5a-0.01))≤0.45454
    t∧2－17t－12＜0
    t2－17t－12＜0
    （264*7+88x）/（264*88）<0.17
    （264*7+88x）/（264*88）<0.22
    （264*7+88x）/（264*88）<0.27
    x^2-5x+6=>0
    5－2x＜1
    5－2x＜－4

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