abs(x*x+2*x)>0.5
    -2x+2>x-3
    1÷x＋x≤260
    -1≤m≤2;m≥2
    -1≤m≤2 m≥2
    -1≤m≤2 m≥2
    (1/2)*(x-3)+(1/3)*(x+sqrt2)<(1/6)*(x-sqrt98)+3
    （x-1）/2≤x/3
    2（x-1）≥x-2
    3x-6＜0
    x+2≥-1x
    x+2≥-x
    -2x+1≥-1
    3（x-2）-x＞0
    1/(1+x)
    1/(1+x)
    0.4m+280<314+0.32m
    −3小于等于2
    3*x^2-4x+2 <0
    3*x^2-4x+2 >0

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