200a+170(30-a)≤5400
    abs(x-2)
    2[x-3(x-2)]>6(2/3-3x)
    10(x-3)-4<2(x-1)
    x-122/x>5
    21x^2-6x+5>0
    x/1.05*0.05=1449.02
    2x+1≥-1 1+2x/3>-1
    x∧2－4x－5>0
    x∧2－20x＋19<0
    （2y－4）^(2)－4（y－2）（3y+7）≥0
    6m+8（30-m）小于等于200
    x-2大于0
    4（y-2）^2-4(y-2)（3y+7） ≥0
    x*0.02>1640-x
    x+x*0.02>1640
    -450+x+（x*0.02）-690>500
    -450*x+（x*0.02）-690>500
    (X-30)(－2X+160)≥800
    4a^(2)－a+4<0

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