3x2-12小于0
    2x^2+9x+9<0
    1.5^3-1.5-1
    -2x<6
    x-3x-2/4>=2(1+x)/3-1
    （4—2x）（30—2x）=600
    x^3-9x^2-9x+81=0
    2x^2-2x-5≤0
    8*ln(1+k^5)/k^2<0.0001
    (k+1)^2<0.0001(2+3(k+1)^4)
    8ln(k^5+1)<0.001k^2
    -4082750+3000000+w-w×10%÷4-450000=300000
    4x-6=2x+3
    sqrt（9）
    （X+1）*（X-3）≤0
    （X-1）*(X+3)≤0
    -X^2+2X+3≥0
    0.18^n <= 0.001
    0.2^n <= 0.001
    0.15^n <= 0.001

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