-2p<=-2
    0<=5n
    -6>5n+5+4
    -1<=2n+4-5
    4x+1-1>=8
    0>3x-3-6
    x＾2-3x+5>0
    4*x＾2-12x+9<0
    -x＾2+3x+10≥0
    -x＾32≥0
    5×x＾2-x-6>0
    2x-x＾2-3>0
    C(200,x)+0.02^x=0.98(200-x)<0.01
    2x+1>x^2+x-1
    M×M-3<2M+45
    5(5x+2)+2>=37
    x-(x-1)/3>1
    3(x+2)>=4(x+1)
    （3x-2)/5>(2x+1)/3-1
    50+0.4x≤0.6x

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