abs(2x-2)/sqrt(x^2+1)＜1
    1000x+800(10-x)>=8500
    4a²-12a+1＜0
    x+x/2+2 >= 2+2√x*x/2
    4a×(a-1)＜-1
    x+x/2+2>=2√x*x/2+2
    (x+5)*18>1818
    x^2-3x+4大于0
    -2x^2+x小于等于-3
    -2x2+x小于等于-3
    -2x2+x小于等于3
    -2x2+x小于等于0
    2－x╱x-3≥0
    2－x╱x-3≤0
    0.25*(sin(x/2)^2)+9/64*(sin(x/2)^4)<0.005
    -m-√（m²+8）≥4
    -m-√（m²+8）＞-3/4
    710v/(v^2+3v+900)>10
    2sqrt2(k-sqrt2)/3<0
    k-(8sqrt10)/3>0

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