52x+28(30-x)<960
    2x+3<0
    x1+x4+x5+x6+x7>=300 x1+x2+x5+x6+x7>=300 x1+x2+x3+x6+x7>=350 x1+x2+x3+x4+x7>=400 x1+x2+x3+x4+x5>=480 x2+x3+x4+x5+x6>=600 x3+x4+x5+x6+x7>=550
    x^2-6x+1<0
    4－x^2≥0
    （x-3）（4-x）＜0
    x＾2＞1
    7x+3<20
    3x-18<-8x-10
    （1-x/50）^4*(1+x/10)>3
    （1-x/50）^4*(1+x/10)>1
    (3+3m)m＞0
    (2-m)m＜0
    a∧2-1/4＞0
    -x^2+4x+7＜0
    1.3*（x+0.5）＞1.5*x
    4x^2-3x≤0
    (x-60)(120-x)>=500
    4x+15≥5x+13
    1.6*x+1.2*(80-x)<=112

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