t
    {1.8-8x}/1.2-{1.3-3x}>{5x-0.4}/0.3
    sqrt(2-4x) <= 0
    32-x÷30=1/10
    (x-2)÷3-(3x+5)÷2≥x-(2-x)÷3
    b>5
    (x-2)÷2≤(7-x)÷3
    200x+100(34-x)>=4000
    （a+1）（2a+3）=0
    －x－12≤0
    3(x-2)+5<4(x-1)+6
    (1-2x)/3+1/5>0
    2x+5>=3(x+2)
    128≤-4x^2+48x
    128≤-4x^2+24x
    x^2-6x+32≤0
    2x>-1
    （2k-1）^2<5
    6x>x+10
    5x-3≤2x+9

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