(97-0.7*n)/sqrt(0.21*n)>1.65
    -1/(2k-1)<0
    -1/2k-1<0
    4（x-2）＞2（3x+5）
    x+3/6≤6x
    x－6x＋5≧0
    3X^2＋6X-4＞0
    3x^2＋6x-4＞30
    x^2+4>=0
    3-2(x-1)>-1
    -2x^2+x+3>0
    （－38n/39）+19－（38/39）＞0
    sqrt(x^2+1)-x>1
    (1283-i+3)/2(i+2)>=5
    -80+X-X*2%>50
    X2+3＞4X
    64x^2(1-x)^2-x^2-16x(1-x)^2>0
    16x(1-x)-2+x>0
    16x(1-x)(2-x)>(2-x)^2+16x(1-x)^2
    √40≥0.4√(50-x)+0.8√x

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