12n^2+283n≥500000
    -1≤sqrt(x)-(x-3)/2≤1
    （1/4）y<=-(3/4)y
    2x^2－x－1＜0
     x+23(x+1)<1232+(x+1)(x+21(x(x+32)+1))
     x+23(x+1)<1232+(x+1)(x+21(x+1))
     x+23(x+1)<1232+x
    x+54>3425 x<1232+x
    0.8^n<0.1
    155+x/160*100%≥99%
    155+x/160*100%≥99
    49.65-9.58k>0
    50.35-15.245k>0
    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

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