35≤a≤3(50-a)
    （x-4）÷2+4>x+1
    1-3（x-2）≤8-x
    250000+4500（b-50）≥400000
    x-2x≤ 0
    1500b+260（130-b）≤58600
    lnx+x+1<0
    lnx+x+1
    x+1/3≥x一x-1/2
    128+128×（1×x）＋128×(1+x∧2)=608
    x+2≥3 1/2x-2<0
    3(x-1)+9≥5x
    5x+2≤3(2-x)
    （24.2-x）/x*100%=1.7%
    1700x+1800(25－x)≥44000
    3(90－3y)+4y≥145
    10(y+2)+15y≥95
    (14－4y－3)/4－(y－3)/3≥1/12
    x+2(1+3x)≥9
    7x+3(40-x)≤240 4x+6(40-x)=190

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