a<2+a=0>
    e(-Xπ/√(1-X^2))×100%＜5%
    -(97-0.7*n)/sqrt(0.21*n) >1.65
    -(97-0.7*n)/sqrt(0.21*n) <1.65
    (97-0.7*n)/sqrt(0.21*n) >-1.65
    (97-0.7*n)/sqrt(0.21*n) >100
    (97-0.7*n)/sqrt(0.21*n) >3
     (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

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