（x+20）（300-x） = 8700
    2.3 - x - 0.45 * ( sqrt ( 0.9 + x ) - sqrt ( 0.9 ) ) >0
    2.3-x-0.45(sqrt(0.9+x)-sqrt(0.9))>0
    M*30*36%*70%=40000+M *30*6%
    20－x＝8
    1/2×x(x+1)＜2001
    4x^2+5x+9＞0
    8a^4+4a^2＞0
    x3+3x2－9x－27=0
    8/(4x^2)-x/(16x^4)>0
    8/(4x^2)-x/(16x^4)<0
    [(2x-5)(x+1)]/[(x+3)(x-2)]>3
    (x+3)/(x^3+x^2-16x+20)<0
    [(x-1)(x+2)]/(2x+5)>0
    e(-3.14x/sqrt（1-x^2）)≤0.3
    x－（1.2x×0.8－200） = 440
    (21+d)(21+4d)<(21+11d)
    1+x/1-X大于0
    1+x/1-x＜0
    2/X-1＜0

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