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
    -12500+x-(50000+x)*12%÷12≥5000
    x^2-2x-3≤0
    (XX-X-2)
    X/(X-51.75)=2.71
    X/(X-51.75)=2.05
    －2－y≥－3
    －2y＋2>y－4

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