6×x+7×x=220
    60a+80×（10-a）≥670
    60a+80×（10-a）≤670
    80a+100×（10-a）≤900
    x小于等于-1
    -x小于等于1
    -x大于等于1
    3-5x≥0
    0.6×(1+x)÷12×(1-6%）+x＝11%
    168-X-X×10%/4×3≥30
    n^2+n>=2000
    （x-0.5)(x+1)(x-1)<0
    -450+x-690-x*8％/4≥500
    -0.01x^2+1.7x-1-0.3x≥55
    x^3-10x^2+23x-14>0
    （2x-5）^(2)+（3x+1）^(2)>13（x^(2)-10）
    3x-5/2x+1≤1
    (a-2)*3*3-2(a+3)*3+4a<0
    (a-2)*2*2-2(a+3)*2+4a<0
    4(a-2)-4(a+3)+4a<0

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