x+√（1＋x^2）＞0
    1－lnx／x∧2＞0
    x-(3/x)+4>0
    x^2-60x+800<=0
    x^2-80x+800<=0
    x^2-120x+800<=0
    12x-2000-0.0025x^2>=2400
    X+(x^2)/20<=240
    3x^2+6x<0
    16+3y+3≤16-2y+3
    0.5sqrt(9t^2-60t+23)＜t+1
    abs(t-1)＜0.5sqrt(9t^2-6t+23)
    1175.78t^3≥57.675t+4
    abs(x-1)-abs(x+2)<8
    abs(x+2)<5 abs(x-1)+abs(x+2)<5
    10＞600÷4x＞4
    x-3/x+5≤0
    20x+3000<30x
    log(2,3-x)>0
    (40+x)(20-2x)≥637.5

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