1/2x-1≤7-3/2x 5x-1＞3（x-1）
    1/2x-1≤7-3/2x
    5x-1>3( x +1)
    {2x≤6-x {3x+1>2( x -1)
     [50000*(1+13%)+y]*12% ≤3000+13%*50000
    [50000*(1+13%)+y]*12% ≤3000
    [50000*(1+130%)+y]*12%≤50000*130%
    (2a+2)^2-4(a^2-5)<0
    3x-7≥8-2x
    0
    √(x-2021)≤0
    2.5/(1+x)*3+1.5/(1+x)>8
    －1≤x－2/3≤1
    3-2y<=1
    240a＋2000-200a≥4500
    40a≥2500
    9+4（x-1)>130+3.7(x-20)
    240a+200(20-a)≥4500
    4X>2.4x+16000
    4X<2.4x+16000

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